Chifuyu Orimura/Synopsis

Plot Synopsis

My Classmates are All Girls

Chifuyu is introduced as a homeroom teacher at the IS Academy and Ichika's older sister. She hits him on the head for being an idiot when introducing himself and for calling her "Chifuyu-nee" (she insists that he calls her "Orimura-sensei" (Professor Orimura) at school). After she introduces herself, the whole class gets excited, mentioning that they came to the Academy just to see her, praising her IS talents. As Chifuyu silences the class, she starts explaining the year's content. Ichika tells the audience about Chifuyu's past: she's a Mondo Grosso champion, but one day, she retired and that now, she's become a teacher. Ichika never saw her at home and he feels stupid for having worried about her.

Later, in a lesson, Ichika seems to be struggling with the course, so Maya cheerfully suggests that he ask any question since she's his teacher. Ichika replies that he didn't understand anything, surprising Maya, so she asked the class if there is anybody else who doesn't get anything, to which nobody responds. Chifuyu asks if Ichika has read the reference book before attending the IS Academy, to which he says he accidentally threw it away. Chifuyu hits him on the face with a book and forces him to memorize another copy of the reference book in one week.

The next morning at the cafeteria, Houki is in a cranky mood and tells Ichika to call her "Shinonono-san" and not Houki. When 3 other students (Honne Nohotoke and her friends) come to sit down beside Ichika and start talking to him, Houki leaves. They ask about Ichika's relationship with Houki, to 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 claps her hand and tells everybody to eat quickly. She reveals that she's the dorm supervisor for the First Years and that she'll make anybody run 10 laps around the training ground if they're late.

In the classroom, Chifuyu tells everybody to vote for a Class Representative for the Inter-class Tournament in two weeks. Two girls nominate Ichika, much to his surprise. Suddenly, Cecilia Alcott protests and says it's humiliating to have a man as a Class Rep. She then challenges Ichika to a duel. When he asks about how much of a handicap he should give her, the whole class laughs and says that men were only stronger than women before the IS and that if men fought against women, the war wouldn't even last 3 days. Chifuyu finally approves the duel and books it for next Monday in Arena 3.

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 Tabane is related to Houki, to which the teacher answers that 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. Chifuyu tells Maya to starts the lesson.

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 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" that he did at 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 while dodging her snipers. While they're fighting, Maya comments on how amazing Ichika can operate an IS, even if it's his first time. Upon Chifuyu talking about Ichika's habit to clench his left hand meaning he'll make simple mistakes, Maya comments on Chifuyu's observation as an older sister.

When Cecilia tricks Ichika that she has more than 4 weapon and fires 2 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, when Ichika incomprehensibly loses against Cecilia, Maya and Chifuyu explain that Ichika lost because his shield energy was depleted and that a barrier-neutralizing attack deals damage at the cost of his shield. Maya then says that Ichika's IS is currently on standby, but he can deploy it any time if he summons it, giving him an IS practice book.

Episode 8

Chifuyu and Maya are in the monitoring room to witness the long-awaited match.

The fight has started and Ichika immediately goes on to strike first at Laura, 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. Laura feels that Houki is in her way so she uses her tentacles to remove her out of her business against the boys. 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 of this to pin him down to the ground, but Charles continuously protects him with his Ignition Boost, stating that it's the first time he's using it. Charles then uses her Shield Pierce weapon to brutally punch Laura's shield multiple time, 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. Chifuyu sends an instructor troop to solve the matter. Meanwhile, Charles offers Ichika 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.

In the hospital, Laura wakes up and Chifuyu starts explaining about the VT System (Valkyrie Trace System), a research project banned under the IS Treaty and it was equipped on Laura's IS. Chifuyu then asks who Laura Bodewig was, and that if she's nobody in particular, then it's fine, but she will have to become the Laura Bodewig from now on. Chifuyu leaves and says that Laura cannot become her, making the girl laugh happily by herself.

Episode 9

Chifuyu is seen shopping with Maya in a swimsuit boutique when they hear Ichika and Charlotte's voices in the changing room. Curious, they open the curtains and Maya gets shocked to see both of her students in the changing room. Ichika and Charlotte then gets a moral lesson from Maya in the middle of the boutique about drawing a line even as classmates.

At the beach, Maya tells everybody to enjoy themselves and to return to the inn in time for dinner, to which everybody screams "Yes!". Later on, Maya arrives and asks if she can play volleyball with Ichika's gang, bringing Chifuyu in a very attractive yet skimpy black swimsuit, which everybody praises. Charlotte, who has been gauging Ichika's reations to the girls' various swimwear, notes that he had the most extreme reaction to Chifuyu, which upsets her. She bemoans the fact that she may have to consider Orimura-sensei as a rival, to which Ichika answers that Chifuyu would be a strong opponent in a volleyball match, completely missing Charlotte's point. In the Light Novel, it is revealed that Ichika had inadvertantly picked out the swimsuit that Chifuyu wore to the beach.

While everyone's playing volleyball, Cecilia is seen chasing Lingyin, probably discovering that she faked her drowning just to get closer to Ichika. Lingyin runs into Chifuyu's breasts and both of them get scolded. They then have fun playing volleyball for the rest of the day.

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 Tabane that is troubling her mind, she hesitates. Chifuyu then tells Houki that tomorrow's the 7th of July, a date when Tabane usually shows up.

Episode 10

While the students are eating, things get a bit rowdy when Cecilia gets Ichika to feed her directly. Chifuyu slams open the sliding door and yells at them to keep it quiet, then warns Ichika not to cause any commotions before returning to her meal. 

Later on, the girls have gathered in front of the room that both Chifuyu and Ichika are sharing, listening in on a very suggestive sounding activity from behind the door. When the door falls through due to them leaning on it, they discover that Ichika was giving Chifuyu a massage, much to their sudden relief. Much to their surprise, Chifuyu suggests that they should try out Ichika's massage and Ichika chooses Cecilia. While Cecilia is getting massaged and enjoying it, Chifuyu slaps Cecilia on her rear in a playful manner before lifting up the hem of her yukata to look at her black underwear, much to Cecilia's embarrassment. Finding the underwear to be quite 'bold for a 15-year-old', she teases her about it, wondering what would a high school girl possibly have planned for wearing such things. 

Making Ichika leave the girls with her, she opens a can of beer in front of them and takes a long drink, to their surprise. She then asks them what it is about Ichika that they find so appealing. She cites that since he could cook, clean, and gives wonderful massages, that he would be a great catch for any woman. She then asks, "So, do you want him?" When they reply with, "Can we?", she shuts them down, much to her amusement. She then taunts them by telling them, "If you want a man, go about with the attitude of claiming him for your own. Try to reach my level, you brats".

OVA: "A Sextet Yearning for Love"

Chifuyu walks into the home, citing that it has become noisy all of a sudden. The girls are a bit surprised by her sudden appearance and Ichika gets up to greet her. Just the brief exchange between the two has the girls burning with jealousy at how Ichika treats Chifuyu so much better than anyone else. Feeling their jealous stares, Chifuyu opts to leave the house suddenly, citing work as the reason. She leaves Houki with a quick reminder to visit her own home once in a while before exiting the house. 

Later on, she is seen with Maya at an upscale bar and lounge, Bar Cresendo, lamenting the fact that she had unknowingly become a 'rival' of sorts for Ichika's affections for the girls. The scene is extended even more in the Light Novel; when Maya asks what sort of girl would she like Ichika to end up with, Chifuyu really doesn't answer other than becoming slightly possessive of him, but at the same time, pushing him away, which slightly confuses Maya.

OVA: World Purge

IS Academy comes under assault from an unknown armed force, as well as from an unknown hacker. Chifuyu has the girls: Houki, Linying, Charlotte, Ceclia, and Laura, dive into the Academy network, but they trigger a trap that locks them inside a virtual simulation. She herself suits up to take on the assault unit's IS while Tatenashi deals with the infantry soldiers.