In the first season, the protagonist, Chou Soran, hiding that he is an “outsider” (someone able to use special abilities) encounters a mysterious girl named Fuu Houhou who hold the secret of eternal life.

Together, they will join the Raten Tournament where they will try to solve the mysteries related to themselves.

In this 2nd season that marks the beginning of this fighting tournament between Outsiders, mysteries will gradually be unveiled and new characters will appear.