Yotsunoha

Four friends from the same school—Nono Nekomiya, Makoto Yuki, Iori Yuzuki, and Matsuri Amachi—were members of the light music club and close companions. After their school closed, they were forced to transfer to different schools. Before parting, they buried a time capsule and vowed to reunite three years later, though Matsuri left angrily. When they return to the site as promised, the capsule is missing. They discover it has been repurposed as part of a lost and found game by a former teacher. As they follow the teacher's clues, they begin to recall memories of their time at the school and emotions they once shared.