Shoko is a 36-year-old employee for a foundation involved with business insurance. A fire station located in front of her parents home is burned. The act was a product of arson. She then meets Obayashi at the site of the fire. Obayashi is a fireman. Shoko met Obayashi six months earlier at the Civil Service Office. Shoko and Obayashi also dated at one time before that. A series of arson cases then occur. Shoko begins to suspect Obayashi may be the perpetrator and he is doing it to see her.