Itou first appears to clue the Oni-Baku in on their opponents Kamata and Saejima. She graduated from the same Junior High as they did. She develops a crush on Eikichi, but he is too busy fighting with the others over Kaoru, and this leads to a fight between Tsukai and Onizuka. She is Tsukai's girlfriend for the duration of the series and in GTO we learn from Saejima that the two are married. She is the first girl to be considered a part of the Oni-Baku-gumi, and mainly appears in later volumes at their gatherings.

(Source: Wikipedia)

Before Eikichi Onizuka would become the "greatest teacher in the world," he and Ryuji Danma were members of the infamous biker gang, Oni Baku. When they weren't out riding around and getting into trouble, this duo could be found in school. Doing what you ask? Picking up young women of course! 
(Source: Tokyopop)

Eikichi Onizuka and Ryuji Danma are members of infamous biker duo, the Oni Baku. When not out riding around, they can be found in school, trying to pick up young women. This is the story of the young Onizuka, who would later become the greatest teacher in Japan, and his partner Ryuji in their quest to lose their virginity and reach maturity. 
They are widely feared bosozoku, and are known for their tenacity and viciousness in a fight. However, this lifestyle does not exactly endear them to the opposite gender, so they decide to change their ways. However, this is easier said than done. 
(Source: Anime News Network)


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Yui Itou