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Nono Nekomiya, Makoto Yuki, Iori Yuzuki and Matsuri Amachi all used to attend the same school. As close friends they spent their days in peace together as part of the light music club until the fateful day in which the school they attended closed down, forcing all students to transfer with the four friends ending up at different schools. Before they left they placed a time capsule under a tree at the school, promising to meet again, with Matsuri running off in bitter anger. Upon returning on the promised date, 3 years later with no contact in between, they find their time capsule has been dug up and turned into a lost and found game by an old teacher of their's. While following clues left by the teacher, the four begin to remember memories of the school as well as old feelings for each other.
- Genre: Romance