Five boxes arrive at a woman's home. Inside are diaries and manuscripts left behind by a high school student, Michiko Ono. An encounter with a transfer student appears before Michiko. Unexpected events await her. Terrifying memories are written down. The boundary between reality and fantasy begins to waver. Can Michiko's blood-stained heart, which has undergone “superplastic deformation”, ever return to its original shape? After reading everything Michiko sent her, the woman arrives at a shocking truth...