After seeing her husband off on a three-day business trip to Kyushu, Saki is suddenly visited by her ex-boyfriend Yuuma. Yuuma threatens Saki by demanding the release of a video of them having sex that he filmed while they were dating, and cums inside her. When Yuuma finds out that her husband is on a business trip, he decides to keep cumming inside Saki for three days. Saki initially resists, but she once again experiences Yuuma's intense sex, and although she knows it's wrong, she falls for him.