Mayuki works in a massage parlor. Because this is not a brothel, there are rules prohibiting customers from touching, having sexual relations with employees, even the employees themselves. Due to her extremely seductive body and the need for physical contact in massage, customers often get aroused by her. Seeing the pitiful "gun" that can only be "raised" but not "fired," Mayuki cleverly bypasses the rules by "accidentally" causing the customer's penis to be exposed and rub against her underwear. Then, her underwear "accidentally" slips off, and the penis penetrates deep into her vagina! Comfortably "firing bullets" deep inside her womb! After each massage session, customers are very satisfied with Mayuki's "special service," she becomes more and more popular, and of course, the store remains oblivious to this situation...