A former delinquent and gang member's dreams to become a teacher come true but on the condition that he will quit immediately if he causes any problems. Onizuka is handed the most notorious 2-4 class and the students are already prepared with plans to get him sacked. But his righteous thoughts and strong will help him slowly change the students' hearts one at a time.
Eikichi applies at Holy Forest Academy, and conflicts with the school's vice principal, Hiroshi Uchiyamada. Disgusted by his condescending attitude, he leaves knowing that they never would have hired him anyway. However, the school's chairwoman Ryoko Sakurai, impressed by his character, decides to offer him a job.
The new school year gets off to a rocky start for Eikichi. To his great consternation, not only was he expected to live in a storage room, he has been assigned to teach middle school instead of high school students. He also had to rescue a student, Noboru Yoshikawa, from suicide.
Eikichi learns first-hand what tricks his homeroom students are capable of. Yoshito Kikuchi, a computer expert, releases fake images of Eikichi engaged in BDSM and homosexual acts. Instead of getting mad, Eikichi asks Yoshito if he can create nude celebrity pictures for him.
Anko Uehara and her gang bullies Noboru for hanging out with Eikichi. They manage to tie him up and beat him to a pulp while he is nude, then take pictures for blackmail. After rescuing Noboru from suicide (again), Onizuka realizes the full extent of Anko's behavior. However, Anko's mother is an important member of the PTA, giving her a shield against punishment.
Following Anko's "lesson", Eikichi must face the PTA for his actions. During the hearing, Noboru shows the teachers and parents the extent of his pain—physically and emotionally. Anko's mother, still unbelieving of her child's actions, is forced to realize the truth when Yoshito plays a tape recording over the PA system of Anko discussing the truth about her mother and Noboru with her friends.
While preparing for parent-teacher meetings, Eikichi learns that one of his students, Kunio Murai, has a very young mother, Julia. Eikichi decides that "dates" are an excellent way to get to know the parents, and has dinner with Julia much to Kunio's dismay.
Julia takes Kunio and his friends, Kouji Fujiyoshi and Tadaaki Kusano, out bowling but also invites Eikichi to Kunio's dismay. Julia is called away for work and she leaves the males alone in the venue which almost ends in disaster. On their way home, Kunio and his friends are confronted by local punks who have stolen Hiroshi Uchiyamada's beloved Toyota Cresta. They believe they are saved when Eikichi arrives, however he suggests the punks send Kunio over a bridge in a bungee jump. Kunio jumps, b
Incensed at Eikichi' childish behavior, P.E. teacher Hajime Fukuroda challenges him to a swimming race but loses badly. Meanwhile, Miyabi Aizawa enlists her friend Tomoko Nomura to frame Eikichi as an underwear thief. When she accidentally incriminates Mr. Fukuroda instead, Miyabi berates Tomoko for her stupidity.
Tomoko is shattered that Miyabi no longer wants her as a friend. Eikichi tries to cheer Tomoko up and enters her in beauty contest to help with her self-esteem and invites the rest of the class to the event.
At the talent beauty contest, Tomoko's clumsiness makes her a long shot to win. She discovers that being herself is her special talent and gains newfound respect from her classmates, including Miyabi Aizawa.
Suguru Teshigawara, the math teacher, has an obsessive interest in language teacher Azusa Fuyutsuki. However, Eikichi inadvertently incurs Suguru's wrath when he ruins Suguru's plans to win Azusa over, causing him to plot his revenge.