— Evening. It was the third month of autumn, a rainy season, however, foreshadowing the imminent winter cold. The lonely and somewhat menacing police station was enveloped in silence. The clock was ticking in the chief detective's office, and he himself was sitting in an armchair. Ibara Saegusa is an outstanding detective who solved more than one case. His languid and menacing gaze fell on the papers in front of him, and then on the door at which there was a knock.

— "Who's there?" — A voice as sharp as a snake's asked