On a weekend like any other, Hisakawa Airi and her friends, Takara, Akane and Naoko, find themselves caught up in the underworld antics of the mysterious Fukushin; an organized gang of teenage delinquents.
Now, due to a situation they can't ignore, Airi and her friends need learn the "business" all while dealing with street thugs, a stolen car, three brothers, the police, a flying rat, and the Fukushin's own distorted sense of morality.