The film's story begins when Shiriri, an alien, arrives and turns Hiroshi and Misae into children. To turn them back, Shinnosuke must travel the length of Japan with Shiriri hidden in his butt. Meanwhile, Shiriri's father is moving forward with a huge conspiracy.
(Source: ANN)
Characters & Voice Actors

Nohara, Hiroshi
Main
Nohara, Himawari
Main
Nohara, Misae
Main
Nohara, Shinnosuke
Main
Boo-chan
Supporting
Kazama, Tooru
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