Miwa Namiki's husband is a painter, and within their routine sex life, she begins to sense something amiss. Her feelings gradually shift toward unease, until she finally uncovers the truth: her husband is having an affair. His lover is a young female college student attending art school. Concerned about her husband, Miwa secretly contacts the girl behind his back. She then extracts a confession about the perverted acts they engaged in without his knowledge—acts that included intense anal play. The college student reveals she developed a powerful craving for these acts. Intrigued by this forbidden world she never knew existed, Miwa plunges deep into a twisted lesbian realm with the young woman, exploring tight bondage, analingus, enemas, and scat play. For her, this journey becomes a continuous series of shocking discoveries and intense revelations.