After saving a girl named Keiko from being attacked by a gang, Makoto Fukunaga and Eiji Yamada are expelled from Tsutenkaku High for fighting.

Before they leave, they blackmail the administration into giving them one million yen as a parting gift by threatening to expose their secrets and ruin the reputation of the school.

The next day they respond to a job listing from the front company Takaranoyama Trading Ltd. offering 500,000 yen per month to young men with no experience and are forcibly conscripted into the Kinsu sect through contracts signed in blood, along with Tokichi Kinoshita, a student studying animal husbandry at Yamanosato University who ends up never being invited to participate in the activities of the other yakuza.

Sabu ends up pawning his gold-plated Kinsu sect badge as well as those of Makoto and Eiji to pay off the debt incurred from their failed used panties business.

Makoto and Eiji race to the film set, where Daimon is realizing that the actress is not there willingly, and together they beat up the Asashi sect members and rescue Keiko.