During ovulation, married woman Umi is overwhelmed by an uncontrollable surge of intense sexual desire. Her body temperature rises, her skin flushes, and she sweats profusely. She spends entire nights masturbating in bed, yet remains unsatisfied—driving her to invite men over when her husband is away. Losing all rationality, she surrenders to animalistic urges, chasing pure pleasure through repeated mating sessions. She stimulates her partner's penis with deep, intense blowjob techniques, then grinds in cowgirl position or takes forceful piston thrusts, extracting every last drop of semen. In the humid living room, drenched in bodily fluids, their intense sex unfolds—instinct-driven, primal, and culminating in ultimate, unrestrained ecstasy.