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When four-year-old Kun meets his new baby sister, his world is turned upside down. Named Mirai (meaning 'future'), the baby quickly wins the hearts of Kun's entire family. As his mother returns to work, Kun becomes increasingly jealous of baby Mirai, until one day he storms off into the garden, where he encounters guests from the past and future, including his sister Mirai as a teenager. Together, Kun and teenage Mirai go on a journey through time,...