A disturbing plan devised by Director Takahashi comes to light, fulfilling clients' desires for sexual relationships with blood relatives. Contacting an older sister, he tells her that her younger brother wishes to become an actor and asks her to help with a producer's audition. Concerned for her brother, she invites him to a hotel to coach him in acting. What begins as sensual rehearsal gradually evolves into a sexual relationship. The sister, striving wholeheartedly for her brother's sake, finds her heart overtaken by pleasure, moving her body instinctively. Later, during the audition, extreme direction is added to the sister's coaching as she seduces her brother. Confused yet consenting, she mounts him in cowgirl position, trembling and calling out his name as they have sex.