Unfairly saddled with crippling debt after the events of Part I, Itsuki Ninomae and the gang turn to fellow student and daughter of a crime lord Kotoko Teshigawara for help. An intertwined web of loyalties and desire awaits as Itsuki, Kotoko and the others fight for justice.

Rin Akinashi and Itsuki Ninomae embark on a certain "business venture" using a video of Itsuki's creation.

Rin's business partner, Hina Yorozuya, enlists her brother Tatsuya's aid, and the group gradually begins to make a success of their business, although not without some trouble along the way. However, a certain incident leaves them saddled with twenty million in debt to the Yakuza.

Hoping to break free of this situation, Itsuki and the gang make contact with Kotoko Teshigawara, the daughter of the syndicate's boss, with the aim of forming an alliance.

Their enemy: A crime lord. Their target: His daughter.

Can our heroes survive in the face of overwhelming violence?