A man who investigates a case that became aging with a "hobby", Shūichirō Kiriyama. One day after the legendary man was dispatched to the FBI, he suddenly entered the aging management section of the Sobu police station Came back. Moreover, Kiriyama became interested in the "Urashima Gas Station Fire Case" that occurred 24 years ago. In this incident, a gas station in a lonely port town, Urashima Town, burned down, and then a big explosion occurred, and a severely burned dead body was found in the burnt mark. The police decided at the time that the corpse was holding the buttons and physique of the uniform, and the victim decided with former high school student Koji Sawamura and investigated the possibility of accident, murder, suicide, but the truth was dark. It remains covered. At least nine years ago, the murder was aged just a day before it was abolished.