This garden serves as a gateway through time, allowing Kun to meet family members at different stages of their lives:
: He meets his great-grandfather as a young man shortly after World War II, gaining respect for the strength and history of his lineage.
Through these fantastical encounters, Kun learns that his family members were all once children with their own struggles. He eventually finds himself in a surreal "Future Station," where he must claim his identity to find his way back home. He chooses to embrace his sister, finally accepting his place in the family tree. The film concludes with Kun showing newfound maturity and a genuine bond with the infant Mirai.
The film follows , a spoiled and sensitive four-year-old boy whose world is turned upside down when his parents bring home a new baby sister named Mirai . Consumed by jealousy over the loss of his parents' attention, Kun begins to act out and retreat into a magical garden in his family's courtyard.