At a "Fifty-Something Specialized Soap," the manager secretly films middle-aged women who come in daily for job interviews. The footage includes sexual harassment during interviews and content unrelated to actual soap services. Inside the store, practical training sessions are also recorded, featuring married women with no prior experience in the sex industry. This time, a married woman named Rina (50 years old) arrives for her interview. Her voluptuous, mature figure is highly attractive. She undergoes hands-on training with the manager's erect penis, gradually awakening her deep feminine instincts.