Ishura

The True Demon King is dead, but his death does not bring peace. Instead, the world is left full of warriors whose power is so extreme that any one of them could claim to be the greatest alive. Swordsmen from other worlds, dragons, mages, marksmen, and beings that ignore ordinary rules begin converging as the question of who deserves to be called the true hero grows increasingly dangerous.

Yuno enters this chaos after an army of machines destroys her city and the swordsman Soujirou Yagyuu saves her, a man who lives for the chance to fight someone strong enough to challenge him. At the same time, political conflict escalates between the kingdom of Aureatia and the breakaway principality of Lithia. Once these superhuman figures become weapons in a war between nations, the issue is no longer only who is strongest, but who can survive when the strongest decide to fight.