"A colleague's female detective was given a thing and became a dead man." Aoi, who heard the story, discovers a strange commonality with the unsolved case that occurred three years ago. After receiving advice from her sister Yukine, Aoi continued her investigation on her own, but the more she investigated, the more suspicions turned into conviction. "Is the suspect in the station?" I asked my boss's future and Hana for help, but it was too late. It is said that are spreading so far in the station where I thought that there were only friends.
