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 ...