College student Uta loves the mother who raised her alone more than anyone. When her mother suddenly announces plans to remarry, the man she brings home seems kind, and shy Uta gradually accepts the idea after seeing her mother so happy. But Yasushi Tamura is actually a predatory master manipulator. He conditions her mother with sweet talk and sex after coating his cock with an aphrodisiac. Once he has finished breaking down the mother, he turns his sights on Uta.