When 4-year-old Kun meets his new baby sister, his world is turned upside down. Named Mirai (meaning “future”), the baby wins the hearts of Kun's family. As his mother returns to work and his father struggles to run the household, Kun becomes increasingly jealous. One day he storms off into the garden where he encounters strange guests from the past and future — including his sister Mirai as a teenager. Together, they journey through time and space, uncovering their family's story.



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