"By the time this video is discovered, I will no longer be in this world..." In a dimly lit room surrounded by concrete walls, a woman sits on a metal chair. Her face is wrapped in bandages like a mummy, making it impossible to see her expression. The woman's name is Sadako (26). Sadako begins to speak quietly into the video camera mounted on a tripod. "In my 26 years of life, I have committed many foolish sins. Now that I have decided to meet my end, I have decided to at least show some repentance by telling the whole story of how I got to this point and recording it on video..."

The celebration of the wedding of Ikuyo, the younger sister of the prestigious Kameto family, and Sashiko continues late into the night. Since the death of their grandmother, Tatsuyo, a rumor has been circulating in the Kameto family that a "succubus has returned." While Ikuyo waits in the bedroom for Sashiko to go to the bath, she is immersed in pleasure and masturbates, when suddenly she is attacked by a demon...