Since the Edo period in Japan, gladiator arenas have existed in certain areas. In these arenas, wealthy business owners and merchants hire gladiators to fight in unarmed combat where the winner takes all. Tokita Ohma, nicknamed "Ashura", joins these arenas and devastates his opponents. His spectacular ability to crush his enemies catches the attention of the big business owners, including the Nogi Group chairman, Nogi Hideki.

• Kengan Omega (Sequel)