Momotaro and Hidemaro are 1st-years at Otokojuku, a private boys school where true men are made. Momotaro, proficient in academics and martial arts becomes good friends with Hidemaro an underachieving weakling. Omito Date, former student leader, plans his revenge against his former school. Now leader of an evil army from rival Kanto Gogakuren school he fully intends on taking over Otokojuku.

After a major conflict, Kazuma Washio (Hitoshi Ozawa) becomes the 6th boss of Tendokai, Kanto’s largest yakuza group. Wakagashira Date (Hideo Nakano) and Kurata (Yoshiyuki Yamaguchi) secure casino rights from the government, but top officials are soon murdered, and Date is framed. The trail leads to Sanko-kai, a Kansai syndicate forming ties with a Korean underworld led by Myojin Akinari (Noboru Kaneko), brother of Washio’s old rival. Sanko-kai’s boss Onizuka (Hiroshi Fuse), who holds a grudge against Washio, launches a political and violent offensive. As Tendokai fights back to reclaim the casino rights, tragedy strikes—Okita (Yasukaze Motomiya) is targeted. Japan’s largest underworld war erupts again—what awaits at the end?

After his devastatingly fast, samurai-style combat approach sets filmmakers against him, a legendary action star films his own movie—on turf claimed by feuding yakuza gangs, including Japan’s deadliest martial arts assassin.

Akira Kiyota (Ryusuke Nakamura), an ordinary salesman with poor performance and heavy consumer-loan debt, feels crushed by the harshness of reality—far from his wild days as a former biker gang leader. One night, while entertaining clients at a club, Kiyota loses his temper and punches a customer. The club happens to be protected by his high school classmate Kenji Hosokawa (Sho Ikushima). Kenji knocks out the rampaging Kiyota with an ashtray. When Kiyota wakes up, he finds himself in Kenji’s office. Kenji invites him into his yakuza group, telling him this might be his one chance to turn his life around…

Kiyota Akira (Ryusuke Nakamura) and his former classmate Kenji Hosokawa (Sho Ikushima) begin making money using boat-race betting tricks. Kiyota eventually becomes favored by Yamazaki (Taketarino Yamaguchi) and surpasses Kenji’s results, causing resentment to build within Kenji. Ignoring Kiyota’s warnings, Kenji breaks the strict rules of their boat-race scheme in an attempt to earn big on his own—marking the beginning of his downfall. As his funds dry up, Kenji plans to rob the office of Fujiyoshi (Shinra Manzo), the group’s treasurer. He thinks he can get away with it—but…

Takeda (Mikio Osawa) and Tsurumi (Junichi Kawamoto)—who killed their own boss and Wakagashira and rampaged through rival turf—are taken into the Doryukai of the Kurohime family by Ryutaro Dojima (Yasukaze Motomiya). Meanwhile, Chifumi Iwaguma (Hidekazu Akai) of the Udagawa-gumi arrives from Osaka to meet Hozumi (Seiki Nagahara), and an oath of brotherhood is approved at an executive meeting—without Dojima’s consent. To stop Hozumi’s power play, Takeda and Tsurumi are ordered to assassinate him. Acting on his own impulses, Takeda ignores the plan and storms the ceremony alone, igniting a brutal internal war within the Kurohime family. All stake their lives and ambitions on rising through the underworld—who will have the last laugh: Hozumi, Dojima, Iwaguma… or Takeda?