"If the murderer is my high school classmate..." In 2024, in Shibuya, an unidentified youth committed a murder. The protagonist, Aoi, a weekly magazine writer, reunites with her long-lost friends after discovering that the culprit might be a high school classmate. Who and why did this happen? Aoi searches for the truth while recalling her high school days. In the process, memories of the past gradually revive, and something happened on the day of the cultural festival. This is a group portrait suspense drama that connects the events of the past and the present to uncover the "truth".