Kiko Mishima (Hana Sugisaki) was exploited by her own family. When she was little, her mother neglected her. After her mother remarried, Kiko Mishima was abused mentally and physically by her family that included her mother, stepfather, and younger stepbrother. She didn't belong to this family. Somehow, Kiko Mishima disconnects from her family in Tokyo and moves to a seaside town in Oita. There, Kiko Mishima 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. The boy Mushi reminds Kiko Mishima of herself when she was younger.