Ayako is a 35-year-old detective who is hardworking and has a strong sense of justice. However, she is inflexible and works too hard, which causes her to fail often. One day, she arrested a wanted suspect for a murder case, but, unfortunately, her soul was exchanged with the suspect just when she was looking forward to her rewards.

Ryota is an unpopular writer although he won a literary award 15 years ago. Now, Ryota works as a private detective. He is divorced from his ex-wife Kyoko and he has an 11-year-old son Shingo. His mother Yoshiko lives alone at her apartment. One day, Ryota, his ex-wife Kyoko, and son Shingo gather at Yoshiko's apartment. A typhoon passes and the family must stay there all night long.