A friend of the Oni-Baku since their Midnight Angel days, he runs the Sato family garage and repair shop. He first appears to tell Eikichi that his car design won&rsquo;t win the exhibition, and gets taken hostage by Yokokawa until his KS Benz is repaired. He later appears in the Akutsu affair, and at various other times when someone needs a bike fixed, or Onizuka wants to use Masaki&rsquo;s ZII.    Wikipedia

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)

**Hobbies:** Cooking, Driving

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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)

Masami Sato