Unhappy after his new baby sister displaces him, four-year-old Kun begins meeting people and pets from his family's history in their unique house in order to help him become the big brother he was meant to be.

Moka Kamishiraishi

Kun (voice)

Haru Kuroki

Mirai (voice)

Gen Hoshino

Father (voice)

Kumiko Aso

Mother (voice)

Mitsuo Yoshihara

Mysterious Man (voice)

Yoshiko Miyazaki

Grandmother (voice)

Koji Yakusho

Grandfather (voice)

Masaharu Fukuyama

Young Man (voice)

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