Tsubasa, a 19-year-old with a sharp personality and short black hair, is a new girl at the shop with barely-contained G-cup breasts straining against her buttoned blouse. Dressed in a sexy yet innocent uniform cosplay, she captivates from the start. The story follows a regular customer who always targets new girls, attempting sexual harassment—but consistently fails. However, once the massage begins, he's surprised by her strong, skillful kneading. "I was on the track team, so I've got power!" she confidently declares, only to be gently scolded by her with, "Hands stay here, okay!" Though she maintains a firm, professional attitude, the persistent man keeps trying to take advantage. Exasperated, she whispers, "This stays between us, okay?" as she shows him her phone—revealing a secret backroom service. Excited, he roughly grabs her huge tits, then proceeds to enjoy titty fuck and blowjob. Still unsatisfied, he pushes further: "I'll pay extra—let's do grinding in cowgirl position!" Unable to refuse, she agrees. Riding him and grinding slowly, he can't hold back and suddenly thrusts inside. Tsubasa, overwhelmed, begins moaning lewdly. Finally, he flips her over and cums hard all over her uniform in missionary position. She finishes with a cleanup blowjob as a bonus. Her incredible erotic charm makes her seem far from a rookie—definitely one to watch!