Chifuyu is Ichika's older sister. She is 24 years old and is in charge of Ichika's class at the IS academy. She was the Japanese pilot for the first generation IS machines and was said to be the strongest IS pilot at one point before retiring. During her retirement, she looked after her brother and raised him by herself after their parents abandoned them. She deeply cares for Ichika as she sees him as her only family. Chifuyu was also the one who enrolled Ichika to the IS academy to keep him safe from other countries. Chifuyu once wielded Yukihira, a powerful IS energy blade that is now under Ichika's possession. Chifuyu was a close friend of Tabane Shinonono, the creator of the IS, which explains how their younger siblings became childhood friends.

Japan engineered an armed powered exoskeleton "Infinite Stratos" (IS) and it became the mainstream of weapons. Since only women can operate IS, women dominate the society over men. Orimura Ichika is a 15 year old boy and accidentally touches an IS placed in the IS pilot training school. He is found to be the only man who can operate IS and forced to enter the training school. Ichika's busy school life surrounded by girls has begun.

__Hobbies:__ anime, games  

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On a hot day of summer vacation, Charlotte's plan to spend time alone with Ichika at his house is somewhat ruined when Cecilia gets the same idea, later followed by Houki, Lingyin and Laura. The next day, Houki helps out at a summer festival being held at her family's shrine and is surprised when Ichika shows up. 

(Source: Wikipedia)

A program called "World Purge" sends illusions to all the girls about their ideal fantasies.

(Source: AICW)

An extended version of the second season's first episode, which is under the same title.

Japan engineered an armed powered exoskeleton "Infinite Stratos" (IS) and it became the mainstream of weapons. Since only women can operate IS, women dominate the society over men. Orimura Ichika is a 15 year old boy and accidentally touches an IS placed in the IS pilot training school. He is found to be the only man who can operate IS and forced to enter the training school. Ichika's busy school life surrounded by girls has begun.
 
Note: The light novel stopped publishing on 2011 and resumed its publication a year later under a new label, Overlap Bunko. Due to this, the light novel changed illustrators, with CHOCO being the new illustrator of the series.

In the near future, Japan creates an armored suit called Infinite Stratos, IS for short, for outer space usage but was later used as a military weapon until it was finally incorporated as a new sport. The one drawback to the IS is that it can only be piloted by a female, or so people thought, until Orimura Ichika came along. As the younger brother of the famous pilot, Orimura Chihuyu, who represented the nation of Japan and went undefeated her whole professional career, Ichika is the only male in the entire world who can pilot an IS. He was accepted into the IS Academy where all the students are female except for him and he has to train to become a pilot. He is surprised to see that his teacher is none other than his sister Chihiyu and is almost annoyed by all the attention he is getting as the only guy on campus. Almost every girl around him is fighting against each other to gain Ichika’s heart and with all the flirting going around, he barely has time to master using his IS. 
(Source: MangaHelpers)

An anthology comic of Infinite Stratos by various mangaka.

An anthology comic of Infinite Stratos by various mangaka. 
#Cover illustration: Nakayama Miyuki 
#Color illustrations: Tachibana Yuu, Yoshikazu Miwa, Tsurusaki Takahiro, Takuan. (たくあん。) 
1. Sono Kyoukai no Ue ni Tachi (Thin Red Line) - In the Night (その境界の上に立ち〈シン・レッド・ライン〉 -In the Night) [Asakawa Keiji] 
2. Maigo Neko (まいごねこ, Lost Cat) [Shinozuka Atsuto] 
3. Best Wars. (ビーストウォーズ。) [BLADE] 
4. Mucha suru ne! Chifuyu-nee! Himeta Omoi (無茶するね! 千冬姉! ～秘めた想い～, That's Unbelicable! Chifuyu-nee! Secret Feelings) [Kazahana Chiruwo] 
5. Toaru Nichijou no Ryouri Taiketsu (とある日常の料理対決, A Certain Ordinary Cook-off) [Ishigami Kazui] 
6. Laura to Ichika to Chifuyu-nee (ラウラと一夏と千冬姉) [Kon Takuto] 
7. Fukuramu♥Omoi (ふくらむ♥おもい) [Yamaki Rin] 
8. Kore ga ICHIKA Quality. (これが ICHIKA クオリティ。, This is Ichika Quality) [Higata Akatsuki] (陽方暁) 
9. Goetsu Doushuu (ごえつどうしゅう, Having To Share With Rivals) [Benjamin (Kuromasa Shisei)] 
10. CECILIA♥CECILIA [Yoshijima Ataru] (よしじまあたる) 
11. English [Akahoshi Kenji]

Chifuyu Orimura