Great Teacher Onizuka, which is officially abbreviated to GTO for short, is an anime series based on a manga written and illustrated by Tohru Fujisawa.

The main character of Great Teacher Onizuka is Eikichi Onizuka. He's 22 years old, an ex gang member, and he becomes a student teacher. At the beginning of his series, one of his favorite pastimes is to try to peep up girls' skirts at the mall. When Eikichi decides to go into teaching, he initially does it as a way to potentially meet girls. He's very hormonal, and he spends his time trying to peep up girls' skirts and down their shirts. Eikichi begins his student teaching experience at the Musashino Public High School. In the first episode, Eikichi tames the rowdy gangs in the class he student teaches in, and this affirms to him that teaching is what he needs to do.

During his student teaching at Musashino Public High School, he gets to know one of his students, Nanako Mizuki. At first, she helps a group of boys set up Eikichi to try and run him out of the school. However, they get to know each other better, and Eikichi learns the truth about Nanako's family; even though Nanako's family may have wealth, they are no longer as close as they used to be. This is the point at which Eikichi starts to actively resist the urge to sleep with his female students. It is also at this point where he also tries to help his students solve their personal issues.

From here, the series follows Eikichi as he continues his student teaching and moves on to try to start an actual teaching career. As Eikichi works at establishing his career, he deals with his students' bullying tactics and trying to befriend his students. He also has a number of experiences where he turns his students around, while at the same time, learning some lessons of his own.

Great Teacher Onizuka contains fanservice (primarily panty shots), as well as themes aimed at older teenagers and adults; this is definitely not an anime series for younger viewers. Personally, I would recommend Great Teacher Onizuka to anime viewers who are 16 or 17 years of age and older.

Title	Episodes	Release Year(s)	Director	Studio	N.A. Licensor
Great Teacher Onizuka	43	1999-2000	Naoyasu Hanyu/Noriyuki Abe	Studio Pierrot	Tokyopop