Kengan Ashua

A brief description of the Kengan Ashua manga:
Since the Edo period, Japan has had gladiatorial arenas. In these arenas, wealthy businessmen and merchants have hired gladiators to fight in hand-to-hand combat, where the winner gets everything. Toki Taouma, nicknamed “Ashura”, becomes a participant of these battles and crushes her opponents. His impressive abilities attract the attention of major business owners.