In one night, a case took place involving Koharu and her 3 children: first son Hiroki, second son Yuji and daughter Sonoko. Afterwards, each member of the family lived separately. 15 years later, the family meets again. Second son Yuji works as a freelancer writer. First son Hiroki has a hard time communicating with other people. Daughter Sonoko dreamed of becoming a hairdresser, but she gave up on her dream after what happened 15 years ago and she now works a snack bar.