When Tsuneto Furuya was in college, he developed a strong fascination with the calves of a young woman due to his experience of walking up the stairs of Shinanocho Station on the Shinano Line tram. After graduation, he entered the National Institute of Science and met the woman Michiko Kyomachi again. At the research institute, the director, Dr. Yoshikawa, was killed, and Furuya was involved in the investigation. Bachelor of Science Shinomiya, Ms. Sawayama, etc. Are all suspects. Furuya found some clues, but the case is still mired in mystery. In addition, the relationship between Tomoeda-sensei and Michiko is also very mysterious. So, who is the murderer? Is Michiko related to the case? What kind of complicated emotional entanglements are there between them? These suspense are waiting for readers to uncover.