When Sayuki was a university student, she was somehow strongly attracted to Sawada, an elderly professor, and married him while still a student. For Sayuki, married life began with accepting her husband's perverted sexual habits. Then, after a few years passed, Sawada, who was aware of the marked decline in his male function, came up with a new idea for enjoyment and put it into action. It involved ordering his assistant Sagawa, who was rumored to have extraordinary sexual prowess, to have sex with his wife Sayuki. Although Sayuki initially disliked him, she gradually became addicted to Sagawa's rough training and his huge penis...