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, Haru Kuroki, Gen Hoshino, Kumiko Aso, Mitsuo Yoshihara, Yoshiko Miyazaki, Koji Yakusho Added on Amazon Prime 2023-04-01. Youtube Trailer