Kasumi married her former teacher, a university professor. One day, her husband tells her that he will be inviting his students to their home to celebrate her graduation. The students are jealous that the strict professor has married Kasumi, who they admire, and blackmail her by using their past relationships to blackmail her. Their twisted desires lead them to use toys to make her cum right next to her husband, and they bring in their friends and continue to play with Kasumi, even while her husband is asleep...