Yui, aiming to take control of her father's company while he is bedridden with illness, found her half-sister Shiori, who was pushing for the company's dissolution, extremely obstructive. She conspired with the servants and ended up binding and imprisoning Shiori! However, Yui's plan fell through due to the servants' betrayal. Incredibly, both sisters end up being bound and tormented. Though Yui felt guilty towards Shiori, she found herself drawn to Shiori's overflowing kindness... This is a duet of bodily beauty! Yui and Shiori become intoxicated by the digging hemp ropes, repeatedly reaching ecstasy.
