Umi, a married woman, has an inexhaustible sexual desire on her ovulation day. Her body temperature rises as she is constantly in heat. She masturbates all night in bed, covered in sweat. Still not satisfied, she invites a man into her house when her husband is not there. "I want it inside me..." She loses all reason and engages in animalistic mating, seeking only pleasure. With a deep blowjob and a pounding piston-like cowgirl position, she squeezes out every last drop of the man's semen. An intense sex session covered in bodily fluids unfolds in a humid living room.