Liberté, a lawless city that is free from the control of the national government.

Mac, the boy who is living here, makes a living boxing. One day, a monster called "Teraton" appears, and Jimmy, who is Mac's friend and one of his family members, is in danger.

Thanks to the help of a special police unit who is responsible for getting rid of the Teraton, Jimmy and Mac barely survive, but they are hospitalized at a hospital outside of Liberte. However, Jimmy is kidnapped, and in order to find Jimmy, Mac joins a special unit where people with special abilities gather...

(Source: MU)