Great Teacher Onizuka, abbreviated to GTO, is a manga series created by To Ru Fujisawa about the adventures of Eikichi Onizuka, a professor at twenty-two and ex-thug Shonan, a member of the Oni-Baku. GTO is a continuation of the manga Shonan Junai Gumi and Bad Company (La banda pure love of Shonan). In June 2009, Kodansha has published a second series, titled GTO - Shonan 14 Days, more and Fujisawa.

Plot
"Eikichi Onizuka 22 years, teacher, unmarried, very pleased" with this phrase is usually present the protagonist of this manga, because Onizuka decides to take this job thinking it would be "fun" doing this job, hoping to also have relationships "love" with the students. Eikichi is a former mototeppista second dan in karate, a graduate of Eurasia (University 5 th class) who is provided the Chair of the famous section of the 3 rd 4 th year (averages) Kissho private institution (SEIRIN anime) , full of kids "difficult" that will do everything to make life impossible, as they have done with many other teachers before him.
But Eikichi, different from other teachers, will succeed with his sympathy, and sometimes unorthodox ways, helped by the Principal who believes in him and hindered by the deputy who instead hates him (several times for having destroyed his beloved car, a Toyota Ridge), to gain the trust and respect of students in the class quickly becoming GTO, literally "Great Teacher Onizuka". Note that the greeting of Onizuka (very pleased) that he is not chosen at random: in Japanese, in fact, the characters of the word "pleasure", taken individually, can also mean "painful death in the night dew."
GTO is placed in the family of the manga "complaint", which is criticized, exasperating aspects, the Japanese company, highly competitive and fast-paced, similar to what he does with his Tatsuya Egawa Be Free! and Golden Boy. In the manga, Fujisawa alternates then laughs, action, love to broad reflections on modern life and the problems of students: marginalization, violence, misunderstandings with family, teachers egoists who only think about their jobs and salary.
Japan has begun G.T.O. - Shonan 14 Days, the second series of GTO that has 51 chapters and is now in progress. This time the adventures of Eikichi not take place only in the institute Kissho, But also in Shonan, Eikichi old neighborhood where he lived as a boy, with new adventures, new and old loves and the return of old friends. In the manga there are new characters in addition to the return of those of the first series.