Speed

Revolves around a group of high school delinquents who unaccountably fight on behalf of various strangers that they befriend in a single meeting. In this story they come to the rescue of Okamoto Kanako who can't believe that Uehara Ayako, Kanako's tutor, really committed suicide. (Source: MU)

Speed is based on Kazuki Kaneshiro's novel of the same title, which is the third entry in his Zombie Series.