"Mom, I had such a hobby ..." Yuuto found hemp rope in his mother's room. But there is no confusion. I was rather convinced. My propensity to be strangely attracted to the act of binding a woman was inherited from my mother Yuka. Yuto, who was worried that he might be abnormal, was relieved to know that Yuka was similar. My mother is the same as me. Then my mother should understand this uncontrollable urge. Thinking so, Yuto decides to train Yuka in bondage.