Bride of Darkness 1

During his spying on the beautiful young lady through a hole in the ceiling, a young servant, Sanshiro, who has fallen in love with his master's daughter, Momoyo, tortures himself with carnal fantasies. The day her fiancé arrives from overseas to take her away, Sanshiro is filled with disbelief as she watches in awe as Momoyo and her fiancee indulge in some wicked S&M activities with one other as well as different members of the home. As time goes on, Sanshiro becomes sure that these odd rituals are intended to summon some kind of monster, and he decides to intervene in order to prevent Momoyo's fiancée from harming the woman he loves by murdering herself.