In one night, an event took place involving Koharu and her three children: first son Hiroki, second son Yuji and daughter Sonoko. The tragedy would shatter the family, forcing them each to lead separate lives. Fifteen years later, the family reunites, Yuji is now a freelance writer. Hiroki has difficulty communicating with others. Sonoko dreamt of becoming a hairdresser, but gave up on her dream after what happened 15 years ago. Now she works at a snack bar.