In the manga, Chizuru is the head of "The Mother and Child in School Victims' Support Group." In the anime, she's the president of "The Society of the Study of Victimization of Mothers and Children in Education." Initially, she hates Onizuka but has a change of heart after he makes a brave, unselfish, and risky move to save her daughter, Hidemi.

Onizuka is a reformed biker gang leader who has his sights set on an honorable new ambition: to become the world's greatest teacher... for the purpose of meeting sexy high school girls. Okay, so he's mostly reformed. 
However, strict administrators and a class of ruthless delinquents stand between Onizuka and his goal and they will use any means, however illegal or low, to drive the new teacher away. Perfect, because Onizuka's methods won't be found in any teaching manual; he cares about the difference between legal and illegal activities about as much as he cares for the age difference between himself and a high school girl. 
So get ready for math that doesn't add up, language you'd be slapped for using, and biology that would make a grown man blush... unless of course, you're the Great Teacher Onizuka. 

 Note: Episode 1 has an airtime of 48 minutes.

[Website (WMG)](https://wmg.jp/shimamotosumi/) | [Wiki (JP)](https://ja.wikipedia.org/wiki/%E5%B3%B6%E6%9C%AC%E9%A0%88%E7%BE%8E)

A Japanese actress, voice actress and narrator of film, anime and video games. She is currently independent of any talent management company.

After graduating from the Toho Gakuen College of Drama and Music, she joined Gekidan Seinenza, a theatrical acting troupe. Her best-known voice roles include [Nausicaä](https://anilist.co/character/539/) in [Nausicaä of the Valley of the Wind](https://anilist.co/anime/572/), and [Kyouko Otonashi](https://anilist.co/character/4745/) in [Maison Ikkoku](https://anilist.co/anime/1453/).

She won the role of Nausicaä as she had played [Clarisse](https://anilist.co/character/11236/) in [The Castle of Cagliostro](https://anilist.co/anime/1430/) and impressed Hayao Miyazaki.

She is married to Daisuke Koshikawa, one of the founders of the comedy troupe Chibikko Gang. Their first child, [Shiori Koshikawa](https://anilist.co/staff/185752/Koshikawa-Shiori), has also done voice acting.

(Source: Wikipedia)

Former juvenile delinquent Onizuka finds himself thrust into to role of high school teacher, facing students who behave just as he used to and an administration that doesn't trust him. Using the brash an unorthodox methods he picked up in his youth, Onizuka manages to reach through to his kids and help them with their problems. (Source: Tokyopop) 
Notes: 
- Won the 22nd Kodansha Manga Award for Best Shounen Manga. 
- The chapter count includes the 7 chapters extra GTO: Great Toroko Oppai♡ (Tomoko's Big Adventures) published in volumes 11 and 12, and one extra published in volume 25.

Chizuru Oota