Japan's largest theme park is 'Wandering Wonder World'. Even today, there is are large cast working there. However, that is only the side presented to the public. This park is the manifestation of negative essence and was built for the sake of sealing away 'Shadow Demons'; a giant 'Demon Ring'! All the cast who work there are 'Demon Ring Guardians' who protect the Demon Ring. Even today, they're running about the park as casts in the day and Demon Ring Guards at night.