Mami Kobato, who is not good at sports, shyly performs masturbation on camera. To help her overcome her weakness, she receives training infused with erotic elements. She does sit-ups and push-ups while giving blowjobs, showcasing her determined efforts. As punishment for failing to complete push-ups, she is seduced into sex. Throughout it all, Mami wears a subtly happy expression, her charm and playful reactions making her utterly endearing.