A small village in the mountainsrnThe hanging body of a young girl is discovered in an old school building in a secluded village. rnThe girl's name is Kaede Kirishima. rnBefore her incident, she had confessed her feelings to her childhood friend, Aoi Takanashi. rnWhat remains in Aoi's memory is her sullen face, her laughing voice, and the echoes of their overlapping actions. rnA certain doubt crosses Aoi's mind. r n Convinced that Kaede was killed by someone, Aoi takes action against her. r nOne day, Aoi is called by a mysterious transfer student, ``Minazuki Hydrangea,'' who has been isolated inside her classroom. rnrnHydrangea: Come... Ah