Ryota Takeshima (Masataka Kubota) has followed in his father's footsteps and now works as a prison officer at Kitakanto Prison. He has witnessed corrupt prison officers who tolerates bullying and gambling. Soichi Nakui (Yukiyoshi Ozawa) then becomes the newly appointed prison chief. Soichi gives an order to Ryota, informing him that he will get rid of prison corruption.
A series of grotesque murder cases takes place on rainy days. Detective Hisashi Sawamura (Shun Oguri) works to catch the murderer like he has done with past cases, but he soon realizes the murderer's next target is his wife and son. A man in a frog mask is a suspect.
An incident is talked about all over Japan. The case involves the Doisaki couple that killed their 15-year-old daughter and hid her body under their house for 16 years.
One day, housewife Toshiko Hagiya visits Shigeko Maehata (Yukie Nakama) who works for a small editing company. Toshiko tells Shigeko that her 12-year-old son Hitoshi might have a special ability to see other people's memories. She pulls out a picture drawn by Hitoshi. The picture has a girl with a grey colored face lying in a house that has a bat shaped weather vane on its roof. The picture seems to depict the incident involving the Doisaki couple. Shigeko decides to do some research, but Hitoshi dies in a car accident.
Meanwhile, the attorney for the Doisaki couple tells their second daughter Seiko that the couple has cut off all ties with her. Around that time, a female high student is confined.