Infinite Stratos Wiki
Infinite Stratos Wiki

Tatenashi Sarashiki (更識 楯無, Sarashiki Tatenashi?), true name Katana Sarashiki (更識 刀奈, Sarashiki Katana?) is the Student Council President of the IS Academy, the IS Representative of Russia and head of the the Sarashiki family. She is the sixth heroine to appear in the series.


Tatenashi is a beautiful teenage girl of average height with short blue hair with a short bangs in the form of V, pale skin, dark red eyes and a very voluptuous and mature body; having slender limbs, large breasts, a water-snake like waist with no trace of fat on her, yet firm muscles and a perfect-curvy butt.[1] Ichika has stated that the figure of Tatenashi is not just good, but really outstanding.[2] Her IS Academy uniform is slightly modified consists of the typical white and red blouse, a skirt that is slightly short compared to others, with a yellow tie, and a short pale green sleeveless overcoat around it, along with red leggings.

She is also known to dress scantily in front of Ichika just to see his reactions, which she finds 'cute' (e.g wearing only her underwear with a simple white shirt or a 'naked apron', although she did wear a swimsuit underneath).

She usually has blue fans with her that display kanji that indicate what she is going to do or what she is talking about. Her IS suit is dark blue version of standart suit.


Tatenashi getting in on the fun

Tatenashi has very flexible personality. She is said to have very high standards due to her prestigious family, where everything must be done perfectly. Despite that, she has, as Ichika puts it, "a wild or rather whimsical personality with slight cat-like mischief." She enjoys teasing people (her unfortunate victims are mostly Ichika and Laura). Even in battle, she tends to mess around with her opponents in order to see their expressions when they realize she has them beat, making her look very villainous.[3][4] Despite her tendency to tease others, Tatenashi has also shown moments of being flustered, mostly as a result of her newfound feelings for Ichika.

She is very charismatic and a natural leader, easily earning the respect and trust of most of the students at the academy. She even got the normally difficult Houki to become friendly with her after a short while, which greatly surprised Ichika.

Tatenashi teasing Ichika with her body by wearing a revealing and subjective outfit

Her teasing includes appearing before Ichika half-naked or even asking him if she should undress herself. She often does both when she has him give her a massage, after which she teases him about him enjoying it. Tatenashi also teased Houki about how her breasts were slightly bigger than her own. She seems to have stopped teasing Ichika on the subject, ever since she realized her feelings for him. She even gets clearly angry with him whenever she sees him looking at other girls' bodies. She still enjoys teasing girls on the subject and putting them in embarrassing situations, such as the Live Cosplay Changing Race. While Tatenashi didn't mind if Ichika saw her in her underwear when she's planning on teasing him, she get's embarrassed if it happens unexpectedly for her.

She does have a serious side, though she tends to talk playfully even when serious, so it can be difficult to determine just how seriously she is taking things. Tatenashi takes failing rather hard, due to the fact she has many titles and positions (Student Council President, Sarashiki family head, and IS Representative of Russia) and because of fact that she is skilled at almost everything she ever does. While rarely seen, Tatenashi can be a bit naïve do to being raised in a high class family.

Tatenashi confidence in battle

She is also a little insecure when it comes to her sister, as she wants to help/support her, but they do not get along with each other, due to their competitive personalities and natures - a holdover from their childhood. This is one of the few topics where she shows a gloomy side instead of her normal cheerfulness. After the Golem III attack, she has finally managed to repair her relationship with Kanzashi and has been able to spend more time with her.

Despite all of the advances she made on Ichika, and joking she could fall in love with him (which ends up happening), Tatenashi is actually quite innocent when it comes to being in love herself despite her seductive behavior around him. Having never been in love before, she found herself being unable to control her newfound feelings. This resulted in her becoming very nervous and overly-conscious around Ichika, displaying none of her usual confidence or playfulness that she would before. This sudden change made it easy for others to notice her newfound love for Ichika. After finally coming to terms with her feelings for Ichika, she started returning to her previous self around him, but would also get in the way of the other girls when one of them is trying to get closer to him. She now flirts with with him more honestly compared to before, often getting ahead of the other girls in situations.

Infinite Stratos & Abilities

As the next head of a secret organization and the current IS Representative of Russia, she is exceptionally skilled in many areas related to IS and other skills related to fighting. She's been considered a prodigy, even by her family high standards since she was a child. She is known to be talented in mixed martial arts and armed combat, Karate, No Rhythm, Taekwondo, Capoeira and Judo. She apparently has developed a knack for unlocking Ichika's room lock (much to his chagrin). Outside of her combat skills, she is very cunning and intelligent in many fields. She usually puts her wits to work by managing the students at IS Academy while keeping Ichika close to her. She likewise said to be very skilled at almost everything she does, including cooking. Ichika, who is a capable cook himself, admitted Tatenashi's cooking is better than his. She also quickly hacked a military computer which contained information about Squall Meusel.

Tatenashi fighting without her IS on

Tatenashi has displayed to have very superb physical abilities surpassing many of her fellow students at the IS Academy, including the other highly trained personal IS pilots. She is very strong and has both excellent reaction time and fast reflexes, having easily countered attacks from Laura[5]and Houki[2] with ease. She has been shown to dodge gunfire from multiple shooters simultaneously (OVA: World Purge-hen). She also seems to have a extraordinary durability and resistance to injury. Being able to take a huge explosion to close range from automatic IS (Golem III) which Tatenashi to destroyed when armor IS completely disabled (Houki had told her not to because she thought she would die).[6] Kanzashi thought she died when she saw her on the screen; but he was still alive. She also received a sword in the back from the other Golem III without defense or armor, but didn't lose conscious until the fight was over.[6] She also seem a very good swimmer, managing to swim a few kilometers from the shore up to a vessel (American transportation; which is believed to have information about Phantom Task) to climb on it effortlessly he showed no signs of fatigue (as opposed to Ichika who was breathing heavily)[7]. Tatenashi is an extraordinary skilled gymnast, acrobat, stunts such as flips, rolls, and springs.  

Furthermore, the title of President of the Student Council goes to the most proficient student, thus explaining why she is the SC President even though she is a second-year student. She has more than once defended her right to the position by easily defeating any of the other personal IS pilots at the Academy. However, her overconfidence in being the strongest student at the academy can cause her to leave herself open to dangers and counter-attack, and as a result has gotten injured when she could have avoided it by being more careful.  

Her personal IS is the 3rd Generation Type, Mysterious Lady (ミステリアス・レイディ, Misuteriasu Reidi?). The Mysterious Lady's exoskeleton is mostly parts of the leg, with only a few parts above the waist. The lady with a unique appearance that's surrounded in mist had crystal-shaped items floating on both left and right sides (for Ichika they were really eye-catching). The objects called Aqua Crystals activated the screens of water that covered Tatenashi like a huge windbreaker. Previously the unit's name was "Gustoi Touman Moskwa" (roughly translated to Moscow's Deep Mist). It uses a large spear/lance, and controls a special type of water that can charge the lance with power, create a fake, block strong attacks, turn into mist and explode.


In the Light Novel, she is the 39th leader of the Sarashiki family. Behind the cover of a traditional family with a long history, it's actually a secret organization fighting against another secret organization known as Phantom Task. It is revealed that her name, Tatenashi, is not her real name due to family tradition that the eldest sibling of the Sarashiki family must replace his/her name with Tatenashi when he/she becomes head of the family. At the final part of Volume 8, she reveals her true/former name to Ichika: Katana.

Plot Synopsis

Anime Description:

She is seen standing on a building, claiming that it is time for her to make her moves, while looking at Ichika from afar.

Novel Description:

She first appeared behind Ichika to tease him before disappearing from his sight. Later during the introduction speech for the cultural festival, she introduced the "Every Club Fight For Orimura Ichika War" to get him to forcefully join the number one club and to make the girls motivated to do their best.


  • "Welcome back. Do you want dinner, a bath, or... do.. you.. want.. me?"- Tatenashi to Ichika.
  • " perverted things to me too..."-Tatenashi to Ichika.


  • She holds the unofficial record of making Ichika get a nosebleed when she makes him massage her. Ironically, after falling for him herself, Tatenashi end up having nosebleeds when she imagined being in a relationship with Ichika.
  • Tatenashi is Ichika's third female roommate in Room 1025.
  • The first such appearance is a cameo in Volume 4, Epilogue; published March 25, 2010. He also appears in anime in an adapted version in Season 2, Episode 1.
  • In the Light Novel and World Purge OVA, she revealed her real name to be "Katana" to Ichika. Stating that the eldest child and head of the Sarashiki family must take the name 'Tatenashi'. Her real name is not supposed to be known to anyone but her family and that telling it to someone of the opposite sex is consider a sign of affection in her family. Because of this, she began thinking of making Ichika marry her someday after remember this.
  • Tatenashi has many similarities to Tabane: Both are respected geniuses, both are very cheerful and playful and somewhat lecherous. Both of them have younger sisters whom they love and care about but who feel inferior to their elders and started to avoid them as a result (this problem has been solved in Tatenashi's case).  The main difference between the two is that Tatenashi has no problem talking to and being with to other people while Tabane doesn't really care about most people.
  • Outside the IS universe, Tatenashi is extremely similar to Chō'un Shiryū from Koihime Musō in both physical appearance and personality (both have short light-blue hair, red-shade eyes; both are top-tier fighters with intellect to match; and both are always calm, playful, and often quite perverted). It is possible that Tatenashi is based on Chō'un, as IS came out 2 years after the release of Koihime .
  • She has a similar appearance to Sen Yarizui from "Ben-To"; but appeared on April 21, 2011.
  • She also has a similar appearance to Ruka Suirenji from Hayate no Gotoku; but made its first appearance in Volume 25 August 18, 2010.
  • She has the same birthday with Chifuyu Orimura.
  • Tatenashi means "Shieldless". This refers to the unyielding will to defend, even without a shield to rely on. This is described as the duty of the head of the Sarashiki family.
  • Despite her usual fearlessness, Tatenashi can't handle haunted house and other horror related subjects.
  • Her measurements are B86, W57, H92 (E Cup).


  1. Light Novel Volume 5 Ch 2
  2. 2.0 2.1 Light Novel Volume 5, Chapter 2
  3. Light Novel Volume 5, Chapter 4
  4. Light Novel Volume 8, Chapter 2
  5. Light Novel Volume 5, Chapter 1
  6. 6.0 6.1 Light Novel Volume 7, Chapter 4
  7. Light Novel Volume 9, Chapter 4
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