Yakuza brothers Seiji and Yoshifumi are the only rank and file members left of the Muto branch of the Date family. When Muto is unable to cover his share of the expenses for an upcoming gang war, he instead offers himself as a front line soldier. To protect his boss, Seiji sets him up to be arrested, causing other Date members to ridicule him for “escaping” to prison. To protect his boss’s honor, Seiji fights like a demon in his stead.