Aiyoku reijo: Shiofuki inma.

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...