Bondage Hot Springs - Beautiful Sisters' Rope Feast of Submission -

Nanako, the wife, begins to work at a hot spring inn deep in the mountains in order to pay off her husband's debts. Her husband's older sister, Reiko, feels guilty towards Nanako, who is taking over her younger brother's debts, and hears dangerous rumors about the inn where Nanako works, and ends up heading to the inn. What Reiko saw there was Nana's completely transformed figure, tied up by a cliff. Reiko decides to offer her body to Nanako's slump. However, the feel of the hemp rope that penetrates into her crotch gradually drives the step-sister's rationality to her...