Private detective Satoshi Suzasaki works with Asuka, his sexy partner. They're both in charge of investigating a strange case of bodies cut into pieces. In the meantime, a chap blackmails a girl for he has a videotape of her masturbating. In exchange for his silence, he asks her to spend the night with him. She'll have to suck his cock and hold his load in her mouth. The guy then fingers her, goes down on her and shags her violently.

Bad luck for pretty Mayu, princess Demonia decides to turn her into her prey. Once she has a hold of the girl she sends her to the demonic kingdom where she is initiated to all the pleasures of the flesh. Getting naked, Mayu is fingered and then screwed to activate the devil inside her.