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Synopsis

Kun Oota, age four, has been the center of attention in his small household alongside his parents and their dog, Yukko. The arrival of his infant sister Mirai disrupts the familiar routine; attention shifts and Kun struggles with jealousy and tantrums as his role at home changes. To guide him through this emotional upheaval, Kun embarks on a remarkable voyage across time where he encounters earlier, current, and later versions of his family. Through these encounters he gains insight into family bonds and comes to understand the responsibilities and meaning of being an older sibling.