A small settlement of mountains. A girl 's hanging corpse is found in an old school building in a living village. The girl 's name is Kirishima Kaede (Kari Toshima Kaede). Before the incident, she had confided herself to her childhood friend Kozue Aoi (Takanaashi Aoi). The remnant of Aoi, her reluctant face, laughter, lingering of overlapping acts. A doubt over the Aoi 's mind. Aoi, who was convinced that Kaede was killed by someone, will move to action. One day, Aoi was a mysterious transfer student who was isolated in the classroom It is called Minazuki Hydrangea. Hydrangea Come ... you are interested in me, do not you? Hydrangea has a faint laugh, The darkness of the heart which Kaede had, begins to talk about the past that was sick. It approaches the nose of Aoi, it is white and beautiful skin until hydrangea's pathological. In Aoi 's hard and stiff body, it can not resist the glittering action of hydrangea. Hydrangea I do not know anything. ... Would you like to ask the body directly?