Quiet, introverted women who struggle to stand up for themselves often have no one to turn to. Sakura, an adult college student troubled by stiff shoulders because of her large breasts, is referred to a therapeutic personal gym run by her father's friend. Shy around strangers, she feels reassured by the one-on-one sessions, and her condition begins to improve. Her parents are grateful to the trainer and trust him with their daughter. But his touching becomes more invasive by the day. He then uses cruel threats to leave her feeling trapped as the molestation continues to escalate.