When a seemingly average high school student, Osamu Hirota, is introduced to a mysterious mansion by a fellow student, Soichi, his reality takes a horrific turn. In the presence of a seductive woman named Miwako, Osamu witnesses a chilling scene where Soichi's heart is gruesomely extracted. As Osamu grapples with the surreal events, he is left questioning whether it was a nightmare or the beginning of a sinister and enigmatic tale unveiling before him.