After buying an old coffee shop in a residential area of Tokyo, the master (Katsuhisa Namase) and his wife Yoko (Eiko Koike) rename the store and prepare to reopen it. Then, a girl in school uniform, Tokiyo (Kaho), comes into the store. She says she has been held captive for eight years by a man named Yamazaki and has escaped.
The two most famous Japanese mystery characters have come together to solve a crime. A year ago, a man was trying to commit suicide by jumping off a police station building. He was rescued by two man who happened to be the well known Akechi Kogoro and Kosuke Kindaichi. The famous duo were asked to be the witness and to provide information for police record. From the surface, it was a simple case of suicide. however, soon after the incident, The police lieutenant committed suicide in his office. Slowly from the gathered evident, the two most unlikely case are being linked.
Based on novel 1962 "Kyukei no Koya" by Seicho Matsumoto. A serial murder occurs around the heroine Kumiko because she finds evidence that her father, who should have died, was "alive." Set in 1945, near the end of WW II, Kenichiro Nogami is reported to have died in a Swiss hospital. In fact, he is working behind the scenes to save Japan from destruction. For this cause, Kenichiro Nogami has left behind his wife and nation to work in hiding.