To fulfill the request of a client seeking incest, Takagi Takefumi devises a plan. The client is a perverted, sister-obsessed brother who desires a sexual relationship with his married younger sister. Introduced by her brother, the sister takes a job at a massage parlor, where her first session ends with fully clothed treatment. By the second visit, her guard lowered, she receives an oil massage wearing only a paper thong, her genitals stimulated until she weakly protests, "No… this isn't right," yet succumbs to pleasure, moaning uncontrollably. Blindfolded, she remains unaware that the assistant is her brother as his cock penetrates her. Two male shafts thrust into her one after another, and though she writhes, she drowns in ecstasy.