Rio Ohara, who made a spectacular debut with Fitch, finally releases the ban on bondage that accentuates her voluptuous body! The hemp rope mercilessly cuts into her rare, plump body! She becomes intoxicated with the pleasure of the hemp rope under the intense instruction of her coach, and her masochistic nature blossoms! Rio, a young competitive swimmer who is working hard every day for the upcoming international competition, reunites with her coach, who has been dismissed for disciplinary reasons. In order to push herself to reach even greater heights, she ends up undergoing a unique training program devised by his coach...