After the shocking death of former Seiun-kai chairman, "Oni" Shima Shu (Hiroki Matsukata), Yuuki Mishima (Yuta Sone) takes on the role of Seiun-kai chairman, aiming to expand his clan constructively. Meanwhile, his cousin Atsushi (Junichi Kawamoto), impulsive and violent, continues to keep Kanto on the verge of conflict, though Yuuki manages to avoid war. Amidst all this, the Kansai-based Tatsumi-gumi's lieutenant, Yamanaka (Ryuji Harada), secretly plots to expand into Tokyo. With clashing intentions, internal divisions, and an external threat encroaching, the true mastermind who controls it all smiles in the shadows... Thus concludes this epic yakuza saga!
