Adult college student Ryo secretly removes his condom during sex, ignores his girlfriend Miki’s resistance, and creampies her without consent. He insists everything will be fine because a service claims it can remove 100% of the semen left in her vagina and uterus. But the technician who arrives, Karidaka, is a sinister-looking man with a monstrous cock. His so-called treatment is relentless pounding that makes Miki moan in ways Ryo has never heard and squirt so hard she nearly hits the ceiling, before Karidaka flaunts the final “cleansing” by finishing inside her. Miki becomes so hooked on the service that she starts poking holes in the condoms she uses with Ryo.