Houki Shinonono (しの ほうき, Shinonono Houki?) is the first heroine to be introduced in the Infinite Stratos series. She is a first year student at the IS Academy, the younger sister of Tabane Shinonono (the IS creator) and the first childhood friend of Ichika Orimura.


Houki is a beautiful teenage girl of average height (with taller shape) with long brown hair that she keeps in a slightly messy ponytail (that seems to be divided into two sections) with a green and black ribbon, dark blue eyes and a slim, curvaceous body with no trace of fat on her and large breasts (which are still growing [1][2]).

She usually wears her IS Academy uniform modified with high stockings and black knee-high boots that have white soles. After the battle with the Silver Gospel, she replaces her green ribbon with a red-and-white ribbon that Ichika bought her for her birthday.

Her initial IS training uniform matched the standard ones worn by all other female students, but after gaining Akatsubaki, she changed into one (a uniform) that is predominantly white with a black neckline, and black edges on the legs. Her IS standby mode has a form of white and gold bells on her wrist


Having been raised in a shrine/dojo, Houki possesses a stern, disciplined personality. As such, she had a hard time socializing with other people, so she had virtually no friends, with the exception of Ichika. Ichika thought of Houki as a cute girl, and he helped her out by chasing the bullies away whenever they mocked her. Even as a child, Houki had trouble expressing her feelings for Ichika, and shortly after they first met, she asked him to use her first name, but then she justified it by saying that there were three other Shinononos (her father, her mother, and her sister). Since her place of residence is a kendo dojo, Houki had been interested in kendo ever since she was young. After being forced to move away from Ichika, Houki continued practicing kendo, as it was the only connection she had left with him.

However, as a result of this separation, Houki has a serious emotional problem. Although she has been training in kendo, which emphasizes obtaining self-control as with most other forms of martial arts, she mainly uses it as a way to let out her frustration, making her very brutal towards her opponents. She is very emotionally unstable, often resorting to violence first, and is prone to jumping to conclusions without taking the time to understand the situation. This also made her needlessly aggressive and hostile to almost everyone around her at the start of the series, even not showing some of the staff at the IS Academy proper respect. Whenever Houki gains a new power, it doesn't take long for it to go to her head, causing her to do and say things that she would later regret. Possibly stemming from this, Houki feels 'might makes right' and has always believed that winning is the answer to her problems. She always seems to convince herself that if she wins, everything will work out for her.

Ichika says that Houki is vile at times. This is because she's too prideful and stubborn to agree with others or admit her mistakes whenever she's wrong. Ichika even notes that this is what leads her to make mistakes as a result. She usually wants to be punished for her mistakes and feels worse when she isn't. Ichika was quick to forgive her, but she did accept his kindness because she thought that she shouldn't be forgiven that easily, and often feels that she doesn't deserve someone as kind as him. She does want to change these tendencies but still hasn't managed to make any changes regardless. Houki also has a habit of constantly frowning, as noted by Ichika. She can be very hypocritical, such as not wanting people to ask her about Tabane Shinonono because she's her younger sister but taking advantage of the fact that she is in order to gain her own personal IS and get ahead in life. Even after this, she still tries to keep her distance from Tabane. However, Houki can be cheered up when Ichika compliments her.

Despite her rather gruff attitude, Houki is actually a kind girl. Although she initially acts strict and cold towards Ichika upon their reunion to the point of not allowing him to use her first name, as well as have a tendency to act quite mean to him sometimes, it's largely because she has trouble with her emotions, and she soon drops the façade and treats him much nicer, though she still isn't above hitting him when he makes her really angry or is about to do something stupid. She's also shown to get along well with Charlotte, Laura, Kanzashi, Tatenashi, Rin, and Cecilia, considering them friends, despite their rivalry for Ichika's affection, and often watching their backs in combat. She has also started getting along with other girls her age.

Houki's wild mood swings

Houki has very little confidence in her looks and in being feminine, likely a result of being bullied in her past for being a tomboy. She always feels uncomfortable when she has to wear revealing and/or feminine clothes like dresses or bikinis (a fact that she's well aware of). She also becomes quite shy when Ichika looks at her or compliments her. She also likes seeing Ichika in suits, to the point that in one instance, she finds it troublesome just trying to look at him directly. Notably, when the girls end up in fantasies about their ideal future with Ichika, caused by the program "World Purge", Houki is shown viewing him as an equal, in contrast to the superficial image the other girls have of him.

Houki has some complex thoughts when it comes to using sex appeal to get Ichika's attention. She usually gets angry when she sees any of the other girls trying to get too physically close to Ichika, calling it indecent. Sometimes however, Houki has considered the idea of using her body to attract Ichika, even thinking that Ichika might be attracted to her large bust. However, she still gets easily nervous about actually doing so, such as buying a revealing bikini to attract Ichika at the beach but was too embarrassed to show herself wearing it to him until the last day.[3] Over time, she has become a more used to it. She has likewise become more comfortable with holding hands and locking arms with him.

After seeing Ichika hugging Cecilia during the latter's birthday party, Houki started growing increasingly insecure about her relationship with Ichika. She became bothered whenever she saw Ichika being nice to any of the other girls, even through she understood there wasn't special meaning behind his actions and it was him being his usually considering self. This caused Akatsubaki to awaken in order to fulfill her wish of making Ichika hers by taking control of her body and attacking her friends.

At the end of the Akatsubaki Incident, Houki remembered how it was her fault that Chifuyu retired as an IS pilot, and became overwhelmed with the guilt of what she had done because of her immaturity and weakness. However, thanks to Ichika words, she resolved to finally face her problems instead of running away from them. Because of this, she wasn't bothered by the fact that she was once again an average student without a personal IS.

Infinite Stratos & Abilities

She is masterly skilled in the art of kendo and Iai, having won the national tournament a year prior to the story. Her fighting style is decidedly offensive, as in the past, she has always won her competitions with pure power, and thus she had issues defending against Charlotte Dunois during the Grade Level Tournament.

Her skills of operating an IS are slightly above average, being able to compete with Charlotte Dunois for a short period of time in the Grade-Level Tournament, despite using a training IS.

Her knowledge about IS is particularly limited, as Ichika often thought that he has absolutely no idea what she is trying to say with her punches. In the novel, it is stated she is a C-Rank user, most likely due to her strong emotions towards Tabane Shinonono that affect her ability. However, sometime during Volume 7, her IS compatibility rank increases to S-Rank, dumbfounding Tatenashi Sarashiki, who suspects this was done due to Houki being the sister of Tabane more than anything else.

Houki has initially piloted the Uchigane, an IS unit for training. Later, she gets the Akatsubaki from her sister, Tabane. Although the unit has the highest specs out of the whole series, the level is brought down due to her skills, thus putting her at the same level as the other heroines. Before the start of the main series, Houki was given the Akatsuki by Tabane. It was called the "ruler" of all IS because it could limit the output of other ISs in its vicinity with its Code Red ability. This allowed Houki to heavy wound Chifuyu Orimura and fatally damage her Kurezakura IS while Houki herself was still in middle school.[4] Following the Akatsubaki Incident, Houki had lost both Akatsubaki and Akatsuki, once again becoming a normal student.[5]

She also seems to have some form of abnormal strength, which is seen when she dented a small locker when thinking about Ichika[6], where she twisted the words about him wanting to defend his comrades (his original words), to wanting to defend her instead during their interview. However, this may have just been for comedic purposes of the show. She does use this strength with her swordsmanship. Houki was able to break through Laura's partially-deployed AIC with nothing more than a regular sword and pure strength[7].

Outside of her combat-related skills, Houki is a talented cook. Ichika has also said that Houki is a good swimmer[8].


Prior to the start of the main series, she was a childhood friend of Ichika. Her place of residence was home to a kendo dojo and she has been interested in kendo since she was young. Houki even competed in kendo competitions at a national level and was the winner of the national tournament that was hosted one year before the story of Infinite Stratos began. Due to her older sister, Tabane, being the mother creator of the IS, yet Houki dislikes her because six years ago, Ichika agreed to become her boyfriend if she could win the national kendo tournament of their grade. However, the day of the tournament was also the day the IS were introduced to the world. Because of their links to Tabane, Houki's family was placed under government protection and Houki was forced to withdraw from the kendo tournament. Since that incident, Houki has disliked her sister for moving her away from the boy she loves and abandoning their family.

Sometime after Chifuyu time in Germany and before the start of the main series, Houki was given the Akatsuki by her older sister Tabane. Having gain so much power, Houki went to challenge Chifuyu Orimura. While its unclear who won, Houki had heavy damaged both Chifuyu and her Kurezakura IS, forcing her to retire. Houki was so overwhelmed by the guilt of what she had that Tabane sealed her memories away.[9]

Plot Synopsis

Episode 1: "My Classmates are All Girls"

Houki is introduced to the main series as one of Ichika's classmates. The scene shows that he is the only male in the class, and the only male in school. He glances nervously at his childhood friend Houki, but the latter looks away, making Ichika feel awkward, asking how she's treating him after meeting him for the first time after 6 years.

During break, while everyone's talking about Ichika, Houki asks for a moment with Ichika on the school's rooftop. Houki is shy, blushing and giving short answers to Ichika's questions. He congratulates her for winning the National Kendo Tournament last year, much to her surprise. Ichika then tells her that he's glad to see her again and that he still recognizes her, even though it's been 6 years. He compliments on how her hair is the same too, making Houki blush even more and start playing with her hair.

In the afternoon, Ichika walks toward his dormitory and searches for his assigned room 1025. While he is stunned about the room's luxury design, he hears somebody finishing their shower. A female voice starts introducing herself and Ichika gets nervous, when the girl comes out of the bathroom wearing a towel, Ichika sees it was Houki. Shocked, Houki tells Ichika to look away. Ichika starts by explaining that he is assigned to this room and they might be roommates. Surprised, Houki takes her shinai out and starts attacking Ichika, but he saves himself by getting out of the room and closing the door. Houki pierces through the door multiple times and Ichika trips. As he protests against Houki, other girls wearing revealing pajamas come out of their rooms and start gathering around him. Freaked out, Ichika begs Houki to be let into the room.

Later, Houki asks why are they roommates, which Ichika doesn't know. She starts blushing and asks if it's because Ichika asked the school staff for him to be assigned to the same room as her. When Ichika says Houki isn't serious, she starts attacking him again, but when the other girls open the door to peek into the room, Houki stops and closes it. She starts talking about room rules, mostly about bathroom hours. When Ichika says he'll use the public bathroom and starts thinking about the fact that only females attend the IS Academy, Houki calls him a pervert. As she's preparing herself to punish him with her shinai, Ichika grabs another one and start swinging it, but a bra is stuck at its edge, making him ask "What is this?" Shocked, Houki snatches it. When Ichika says that she's at "that age" now, she hits him on the head with her shinai and knocks him unconscious.

The next morning, in the cafeteria, Houki is in a cranky mood and tells Ichika to call her "Shinonono-san", not Houki. When three other students (Honne Nohotoke and her friends) come to sit down besides Ichika and start talking to him, Houki leaves. They ask about Ichika's relationship with Houki, which he tells them that she's a childhood friend and that they went to the same kendo dojo when they were in 1st grade. Chifuyu reveals that she's the 1st Year Dorm Supervisor and that she'll make anybody run ten laps around the training ground if they're late. Houki is present to witness Cecilia challenging Ichika.

Episode 2: "Class Representative Runoff!"

Ichika is told by Chifuyu that he will be provided with his own personal IS for his match against Cecilia, a rarity since there are only 467 IS Cores that were created by Tabane Shinonono before she disappeared. Relieved, Cecilia says it wouldn't be fair if she fought with her personal unit and if Ichika was stuck with a training one. A classmate then asks Chifuyu if Dr. Shinonono is related to Houki, which the teacher answers they are sisters. As the whole class is shocked and starts bombing Houki with questions, the latter snaps back by saying that Tabane has nothing to with her and that she has nothing to tell the class about her sister.

During the lunch break, Ichika asks Houki to go grab some lunch, but she says she doesn't feel like it. He even invites Honne and her two friends to come along. When Ichika grabs Houki's arm, the latter pushes him and he trips on the floor, much to her surprise on how weak Ichika is. Scared, the three friends fade out saying that they'll pass. Ichika stands up and decides to pull Houki by her hand anyway to go grab lunch. Houki blushes looking at their hands.

In the cafeteria, Ichika explains that he tries to be considerate because it's Houki: her family took care of him in the past, they've been friends since they were kids, and they even went to the same dojo. He wants Houki to let him at least do this much for her. As they eat, Ichika asks if Houki can help him with the IS and that he's going to lose horribly against Cecilia like that. She replies (in a denying manner) that it's because he let Cecilia provoke him. A 3rd-year student comes by and proposes to help Ichika for the IS training, but Houki replies that she'll train him instead, much to Ichika's surprise. The senior student says Houki's just a first-year and that she, a 3rd year would be more suited to teach him. Houki snaps back, saying that she's Tabane Shinonono's sister, shocking the senior student as she leaves.

In the IS Academy's dojo, Houki easily defeats Ichika. She asks angrily why Ichika became so weak after six years. Houki decides to train him three hours every day after school to fix it before he can pilot an IS. In the locker room, Houki isn't sure if she was too harsh on Ichika, but is sure that he hasn't touched a sword in at least a year. Upon thinking that she'll be alone with Ichika after school, she blushes, but shakes her head and tells herself she wasn't thinking of "that".

One week later, in the battle arena's waiting room, while Ichika and Houki are arguing about the past week's kendo training, Maya announces to them that Ichika's IS has arrived, the Byakushiki. She then explains the IS's Absolute Barrier system, which puts the IS pilot's safety at first priority. Upon touching the Byakushiki, Ichika gets the same feeling of "understanding the machine without studying it" as he did during the IS entrance exam. He then flies out to the arena.

Cecilia is waiting for him in the air with her Blue Tears, saying that if he apologizes now, she might consider forgiving him, but he refuses. As Ichika's shield is being destroyed by Cecilia's sniper, he takes off a blade and makes his way towards his opponent all while dodging her shots. While they're fighting, Maya comments on how amazing Ichika can operate an IS even if it's his first time. Upon Chifuyu's observation about Ichika's habit to clench his left hand, she remarks it means he'll make simple mistakes, which Maya comments on Chifuyu's observation as an older sister.

When Cecilia tricks Ichika that she has more than four weapons and fires two bombs, he can't dodge and gets hit. Everyone gets worried, but Chifuyu says that he got saved by his unit. Everyone gets shocked to see Ichika's IS in another form, the 1st Shift. While Cecilia is surprised that he's been fighting with the default settings the whole time, Ichika discovers his weapon, the Yukihira Type 2, the same sword his sister Chifuyu used. Praising his sister, Ichika decides that it's time to stop being the one who gets protected and that from now one, he'll be the one protecting his family. As he easily dodges and cuts down Cecilia's bombs and is on the verge of striking her, the match announcer declares Cecilia the winner, much to everybody's surprise.

Later, after Ichika incomprehensibly lost against Cecilia, Maya explains that Ichika lost because his shield energy was depleted and that a barrier-neutralizing attack deals damage at the cost of his shield. She then says that Ichika's IS is currently on standby, but he can deploy it any time he summons it, giving him an IS practice book.

During the walk back at their dormitories, Houki asks Ichika if it's okay that she trains him. He replies that it's easier than having another girl teach him, and since Houki is Tabane's sister, she knows more about anybody else. Houki blushes and tells Ichika to clear his schedule starting from tomorrow onward, all while giggling by herself, which Ichika doesn't understand.

Episode 3: " The Transfer Student is my Second Childhood Friend"

Episode 4: "Showdown! The Class League Match"

Episode 5: "Boy Meets Boy"

Episode 6: "My Roommate is a Young, Blonde Nobleman"

Episode 7: "Blue Days ~ Red Switch"

Episode 8: "Find Out My Mind"

The fight has started and Ichika immediately goes to strike first at Laura Bodewig, but is stopped by her AIC. As Laura prepares to shoot Ichika while he's paralyzed, Charles appears behind Ichika and counter-attacks Laura with her Rapid Switch, but Houki interferes, stating that she won't have them forget about her. While Ichika and Laura fight, Charles defeats Houki first and resumes his battle against Laura.

During the fight, they discover the AIC's weakness: Laura can only focus on stopping one enemy per time. They then use different "sacrifice-and-attack" combos to slowly defeat her. Ichika gets his energy shield exhausted and Laura takes advantage to pin him down to the ground, but Charles keeps protecting him with her Ignition Boost, stating that it's the first time he's using it. Charles then uses his Shield Pierce weapon to brutally punch Laura's shield multiple times and exhausting her armor. Laura, fainting, is suddenly consumed by her IS and transforms into a large dark mech that matches Chifuyu's fighting style. Angry about this, Ichika decides to fight against it, but Houki holds him back, telling him that he doesn't have to do anything and the matter will be resolved by the instructors troop. Ichika still refuses and Charles offers him enough energy to manifest his sword, making him promise that if he loses, he'll have to wear a female uniform to school starting the next day, embarrassing Ichika and Houki. After Ichika gets enough energy, he cuts through the mech and saves Laura.

Later while Ichika and Charles are discussing about the match in the evening at the cafeteria, they see Houki observing them with a worried face. Ichika then goes to her and says he'll go on a date, making Houki all excited, but stated that shopping was nothing.

The next day, Charles introduces herself to the class under the name of "Charlotte" Dunois, shocking the whole class, including Houki. As everyone knew Ichika and Charlotte used the Boys' Bath the night before, Lingyin charges into the class with her IS to attack Ichika, probably jealous that he bathed with another girl, but is stopped by Laura's AIC. Ichika thanks her, but is suddenly grabbed by Laura as she kisses him in front of the whole class, shocking Cecilia, Lingyin, Houki, and all of the other girls. Laura states that Ichika will be her "bride," stating that it is final and she won't hear any objections from. Ichika and the girls are once again shocked.

Episode 9: "Ocean's Eleven!"

The night before seaside school, Houki secretly calls her sister, Tabane. The latter teases her, pissing Houki off and as she is about to hang up, Tabane tells her not to. She then reveals that she has finished designing a personal IS for her.

The next morning, Ichika wakes up and feels another pair of legs. Shocked, he pulls off the blanket and discovers Laura sleeping naked. As Ichika screams, Laura wakes up and exposes the rest of her body, prompting Ichika to tell her to hide "those". Laura says that spouses shouldn't hide anything from each other. Realizing that Laura misunderstands love, he points at her and asks who's the idiot feeding her false information, prompting Laura to grab his arm and pin him down. She then changes topic, saying that she should train Ichika in pinning techniques and that it's not like she won't help him. Ichika, struggling, asks why Laura's blushing. Meanwhile, Houki knocks at the door, telling Ichika it's time for morning practice and that just because it's Sunday, that does not mean he can slack off. As she walks in and see Ichika and the naked Laura on the bed, she freezes in a shocked/speechless manner, dropping her shinai. Seeing Houki, Laura comments how rude she is for invading the bedroom of a married couple. Pissed and shocked, Houki takes her shinai and punishes Laura.

Later at sunset, it is revealed that Houki skipped the whole seaside school event(although she wore a swimsuit). When Chifuyu joins her and asks if it's about Tabane that troubles her mind, she hesitates. Chifuyu then tells Houki that tomorrow's the 7th of July, a date where Tabane usually shows up.

Episode 10: "Thin Red Line"

Episode 11: "Get Ready"

Episode 12: "Your Name Is"

OVA: "A Sextet Yearning for Love"

This OVA can be separated into two parts

  1. All the girls visiting Ichika. Obviously, an attempt to get closer to Ichika.
  2. The summer festival which is shows Ichika, Houki and Ran Gotanda.

Part 1

All the girls arrive at Ichika's house at different times. All the girls see Ichika-Chifuyu acting like a couple, but Ichika, still oblivious, thinks this is a normal sibling relationship.

Part 2

At the end, Houki confesses to Ichika that she loves him, but the fireworks begin as she confesses muting her "I love you".


  • The name Houki means "broom" (箒).
  • Houki's surname Shinonono means "dwarf bamboo" (篠) (shino) and "this" (之) (no).


  • Ichika: "Is that a new obi?"
    Houki: "Y...You have a good eye"
    Ichika:"Nah, I just noticed since the color and design's different, since I see you everyday."
    Houki: "T...That's right! We see each other everyday...I see...!"

    - Houki and Ichika Orimura's night talk in room 1025 (Chapter 4)
  • Houki: "I-I have something to tell you."
    Ichika: "What? You seem so serious."
    Houki: "About the grade level individual tournament next month...I-If I become the champion...Y-You'll go out with me!"

    - Houki to Ichika after they've been separated as roommates (Episode 5)


  • Houki is the first character to confess her feelings to Ichika Orimura with the second one being Kanzashi Sarashiki.
    • However, the first time she did so, her confession was rendered inaudible by the fireworks. The second time she did, she was asleep when she said it, but Ichika didn't hear her well and quickly noticed she fell asleep.
  • Houki's IS unit Akatsubaki and its swords are a tribute to the MBF-P02 Astray Red Frame from Gundam SEED Astray. Both Akatsubaki and Astray Red Frame are close combat units that use katanas as main weapons. Its inactive silhouette, foot blades, and colors are all reminiscent of the ZGMF-X19A Infinite Justice from Gundam SEED Destiny.
  • Aside from Ichika, she respects and admires Ryuuin Shinonono (Houki's father).
  • Houki is the only known main female character who isn't a representative of any nation or country due to her being the sister of the IS creator and being the only person who possesses a 4th Generation IS that does not belong to any country or organization.
  • In episode 2, when Houki's in the changing room, she's seen wearing a duster. After the few seconds of flashback, she's seen wearing the school uniform.
  • As shown in Volume 8, Houki's ideal world is where she still lives in her family shrine, with Ichika still practicing kendo there and is stronger than her. This is most likely the reason why she always wants Ichika to train harder in kendo, as she prefers him to be stronger than her.
    • Unlike the other girls, Houki's Ichika didn't act or show any lewd behavior. It unknown if this is based on what Chloe Chronicle said about the world purge effects being weaker, or possibly because Houki doesn't want Ichika to act indecent. Ironically, Houki only realized everything was fake when the real Ichika accidently grabbed her breast. Strangely, while Houki was annoyed at Ichika about it, she thought to herself how much happier she was then.
  • Houki Shinonono's Japanese and English voice actors both play Erica Blandelli in Campione!.
  • Her measurements are B98, W60, H81 (I Cup).
  • While both of Houki's personal IS were similar in appearance and weaponry, they each represent opposite sides of Houki and her desire. Akatsubaki has the power to recharge other ISs energy and represented her desire to be Ichikas' strength. Akatsuki has the power weaken her opponent IS and represented her desire to make want she wants her through power.


  1. LN Volume 3 Ch 1
  2. LN Volume 10 Ch 5
  3. LN Volume 3 Ch 4
  4. LN Volume 12 Ch 3
  5. LN Volume 12 CH 4
  6. LN Vol 7 Ch 2
  7. LN Vol 3 Ch 1
  8. LN Vol 3 Ch 2
  9. LN Volume 12 Ch 3

External Links

Infinite Stratos Characters
IS Academy
1st Year
Class 1-1 Ichika OrimuraHouki ShinononoCecilia AlcottCharlotte DunoisLaura BodewigHonne NohotokeKiyoka AikawaShizune TakatsukiSayuka YorutakeYuzu Tanimoto
Class 1-2 Lingyin Huang
Class 1-4 Kanzashi Sarashiki
Others Tina HamiltonAiris Twilight Ruxezemburg
2nd Year Tatenashi SarashikiKaoruko MayuzumiForte SapphireSara Welkin
3rd Year Utsuho NohotokeDaryl Casey
In-game Character Luanyin HuangVishnu Isa GalaxyRorentsuine Laurent di FillneyFaniel CometO'Neil CometVelvet HellCurrier LuccukchefkaGriffin Redram
Other Djbril Emulail
Staff Chifuyu OrimuraMaya YamadaJuuzou KutsuwagiEdwards Franchee
IS Pilots
U.S. Army Natasha FairsIris CallingLeader
Phantom Task Squall MeuselMAutumnRain MeuselForte SapphireAlicia Jiosestaf
Russia Rogna Kalinych
Other Characters
Notable Tabane ShinononoChloe Chronicle
Civilians Dan GotandaRan GotandaRen GotandaGen GotandaKazuma MitaraiYukikoRyuuin ShinononoNagisako MayuzumiChelsea BlankettLei Lei YangExia Blankett
Kuromochi Machinery Development Hikaruno Kagaribi
Schwarzer Hase Laura BodewigClarissa Harfouch
Community content is available under CC-BY-SA unless otherwise noted.