Claire, who lives alone away from her parents and attends university, returns home during a long break. However, when she visits her parents' house, her aunt Yumi, who lives overseas, tells her that her mother is not at home. She feels reluctant to just go home like that, so she decides to stay the night with Yumi at her parents' house, but... Yumi sneaks into Claire's bedroom in the middle of the night while she is fast asleep, tying her body up with hemp rope and enjoying her young body. Struggling between the "forbidden incestuous relationship" and the "pleasure of bringing the body to endless climaxes," she falls into a bondage lesbian hell...