Yumi's son, Shinya, often has his friends stay over, and they are unconsciously drawn to his mother, Yumi. One night, Takaharu accidentally witnesses Yumi masturbating and, overcome with desire, loses control, violently assaulting her and forcing a sexual relationship. As dawn approaches, another friend, Dairo, joins Takaharu in repeatedly coercing Yumi, and the three become entangled in secret, illicit encounters. When Shinya leaves for a school camp, the young men increasingly treat Yumi as their own, dominating her completely as she is forced into intense, humiliating acts of creampie-filled intercourse, fulfilling their NTR fantasies with the married milf.