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.
Hoshikamo yearned to become a private detective and he now works as a private detective. He is not good at communicating with women. Hoshikamo once worked at a big private detective agency, but he now he runs his own private detective office. His office is situated within his grandmother's recycle shop. Hoshikamo solves various cases with his assistant Tsugumi Karato. He first met Tsugumi Karato when she was his client. She hired him to help her with a stalker.