On their fifth wedding anniversary, the Shiomizu couple visited a high-end restaurant. There, the wife, Yuriko, received a discount massage ticket from an employee. Encouraged by her husband, Yuriko promptly visited the massage parlor. Initially, she relaxed during the oil-based treatment, but gradually, the therapist's fingers moved from the groin area towards the anus, claiming it was a medical procedure, and unable to resist, Yuriko was violated. Since then, unsatisfied with her husband during intercourse, Yuriko returned to the massage parlor again...