As the bright sun shines over Japan, a young girl excitedly runs into Wonder Land, the amusement park of her dreams. Waiting at the entrance is the cheerful "Mummy Man" who promises to let her do whatever she wants, and the two embark on an exciting tour of the park.

While passersby believe the Mummy Man to be a kindhearted mascot playing with the girl, growing concern arouses among other authorities.