A festival will soon be held in town. Koyomi School's high school student council helps the neighborhood association organize the festivities. J distributes the tasks to his colleagues, but Hotaru is not present at the meeting. Ren finds the latter face to face with Miss Mikami, a music teacher. Given his behavior, the young teenager seems to have a rather intimate, even forbidden relationship between a student and his teacher... As for J, the organization of the festival does not make him forget his primary motivations, learn more about his past and his presence in this world...