Nana runs an inn called Nakajima-so in a seaside town. One day, a young man named Fujii Shuntaro comes to visit and reveals that his girlfriend stayed at the inn one year prior, just before she died. Following in the footsteps of his lover, Nana takes on the role of guide and joins Shuntaro as he wanders the town.
A man’s body is found in the suburbs of Tokyo. The dead man was hit by a car and his head beaten by the reckless driver after the accident. The dead man had a wife named Noriko. She likes fancy things and she has a lover named Tsukada. It's also learned that the dead man was insured for 300 million yen. The media and the public look at Noriko and her boyfriend Tsukada with suspicion, but they have perfect alibis. Then, Detective Hibiki, who is in charge of the case, and Private Detective Kono become involved in a series of mysterious murder cases.