A group of heroes set out to destroy Cleavatess, the king of beasts. But they stumble on a conspiracy to destroy the world and must rely on Cleavatess to help them out.

Known as a Rogue Hero in the fantasy world Arezard, Akatsuki decided to take upon the request of the defeated Demon King to take his daughter with him. After bringing her back to the world he came from, Akatsuki brought her to join Babel, an academy-like organization that specializes in training those who came from the other world.