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
SupportingPromotion Videos
Recommended for you
Ranma ½ OVA
OVA
30m
School Rumble: Ichi Gakki Hoshuu
OVA
25m
Texhnolyze
TV
23m
One Punch Man Specials
Special
12m
One Punch Man: Road to Hero
OVA
24m
Seitokai Yakuindomo*
TV
23m
Hidamari Sketch x 365 Specials
Special
24m
InuYasha: Kuroi Tessaiga
Special
29m
Wandering Son
TV
23m
KochiKame: Tokyo Beat Cops
TV
25m
Good Luck Girl!
TV
23m
Digimon Adventure tri. Confession
Movie
105m
Fairy Tail
TV
24m
Hybrid Child
OVA
25m