In the Taishou Era, Yatsuse Kotoko hears a rumor: somewhere in the grounds of Seiryouin stands the Hundred-Year Cherry Blossom, a tree that blooms once every century. If you make a wish beneath it when it blooms, the spirit of the tree will grant it. Kotoko is a Kotodama user, and her wish is something Kotodama itself cannot accomplish—she wants to deliver the final words of the late Nishijima to someone named Kusuka. With her lover and her companions, she searches for the tree whose flowering season is about to begin.