Rekihiko Tokiya is an excellent detective in Kyoto. While he chases a suspect, Rekihiko falls into a water storage pool at an abandoned factory. He wakes up in a hospital room and is stunned that he cannot remember anything from the past 20 years. He is 51-years-old, but he cannot remember anything from the age of 31. He resumes work as a detective, but he deals with cases differently than in the past.