Adapted from Haikuo-Soft's creation, this tale revolves around the fateful reunion of four childhood companions - Yuzuki, Matsuri, Nono, and Makoto - within the abandoned grounds of Mochitsuki Academy, their former school. A bygone era saw them inter a time capsule beneath a towering tree on the premises, sealing a vow. This pact bound them to reconvene precisely three years hence. Now, as the appointed day dawns, the time for fulfillment has come.