Sayuki, the wife of a university professor, endured her husband's intense BDSM desires throughout their marriage—until one day, the extreme intensity led to him suffering a sudden stroke and dying. Devastated by loss, her body still craves fulfillment. Beneath her mourning attire, her desires stir, attracting new beasts who subject her to extreme training: spanking, massive dildos, fierce slapping, rose whips, anal stretching, single-tail flogging, and glycerin enemas. Sayuki transforms from a grieving widow into a lustful creature, no longer haunted by her late husband's cruelty, but now thirsting for the pleasures of submission.