Mio lives in Tokyo as a full-time housewife, having left her job two years ago at her husband's request. However, her husband is constantly away on long business trips, leaving her lonely and bored. One day, while sorting through her mailbox, she comes across a flyer for an "outcall massage" service. With nothing better to do, she decides to try it on a whim. The therapist who arrives is North, an older, soft-spoken man of small stature. Contrary to her expectations, his techniques are intensely sensual, and Mio quickly finds herself overwhelmed by pleasure. After the session, she begins to experience strong, persistent arousal—her pussy aches intensely at night, and even masturbation fails to satisfy her. Was it the special massage lotion? The next day, she finds herself craving the same treatment again. This time, a younger, more energetic therapist named Suzuki arrives. Mio had been hoping North would come back...