Kasumi, who married her own mentor, a university professor. One day, her husband tells her to invite students home for a graduation celebration. The invited student is jealous of Kasumi marrying the stern professor she admired and uses past love affairs as leverage to blackmail and assault Kasumi. Their twisted desires lead them to make Kasumi climax with toys while her husband is present, even bringing in accomplices and continuing to toy with Kasumi unabashedly while her husband sleeps…
