Mrs. Uehara visits a chiropractic clinic, suffering from severe shoulder stiffness due to daily housework. The therapist recommends oil massage for effective relief. She immediately feels the benefits as warmth spreads throughout her body. One day, the therapist makes an unexpected suggestion: "Ma'am, how about a sex massage to further improve your blood circulation?" Mrs. Uehara is shocked and flustered. The oil massage has already aroused her, awakening her sexuality. Though anxious about being discovered by her husband, her heart can no longer turn back...