After receiving his part-time paycheck, Akira decides to visit a brothel. Wanting a special experience, he chooses a highly-rated S-class milf soap parlor he found online. However, waiting for him there is someone completely unexpected—his own mother. Panicked, Akira tries to leave, but his mother insists, "I've always had the pride of being number one." Unable to ignore her confidence, Akira finds himself receiving her services. She performs an elegant and erotic bubble bath show, bringing Akira to climax repeatedly. In the end, she gives him the ultimate service: a bareback creampie. That moment becomes a shocking experience, transcending the boundaries of their parent-child relationship.