Mishima Kiko was exploited by her own family. When she was little, her mother neglected her. After her mother remarried, Kiko was abused mentally and physically by her mother, stepfather, and younger stepbrother. She didn't belong to this family. Somehow, she disconnects from her family in Tokyo and moves to a seaside town in Oita. There, she meets a 13-year-old boy named Mushi. He has been abused by his mother and does not speak due to trauma from the abuse. Mushi reminds Kiko of herself when she was younger.
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