Mutsuko has been living on an island to which her grandmother and mother have restricted her from leaving. To Mutsuko, the symbol of her freedom was Dreamland, an amusement park on the mainland, but she learns it will be closing permanently this year. Meanwhile, Wataru returns to the island after nine years due to a job transfer. A pupil of his deceased father pays him a visit and tells him about a side of his father he did not know about.