This anime adaptation is helmed by the visionary master of the erotic anime world, Teruaki Murakami. The source material is the latest collaboration between Hiromitsu Takeda and OZ—the creative duo behind the smash-hit NTR (cuckoldry) game *Insidious Otaku: My Girlfriend/Sister Driven Wild*. It depicts, in a slow-burning and lewd style, the transformation of a cherished girlfriend into a shameless slut after her own boyfriend's family steals her away. "I'm sorry... I can't go back anymore..." [Story] Koharu loses her home in a fire. Arata Asaoka wants to invite his beloved girlfriend, Koharu, to live with him, but he hesitates. The reason? Both his father and older brother are womanizers of the worst sort—scum who immediately prey on any woman who catches their eye. However, unable to refuse his father Genzo's insistent urging, Koharu ends up living at the Asaoka household. Thus begins the tragedy. While Arata is away, Genzo kisses Koharu, snaps a photo, and uses it to blackmail her. Desperate to spare Arata unnecessary worry, Koharu submits to Genzo's demands: striking shameful poses, mouthing lewd pleas against her will, and enduring penetration by his massive cock—not just once, but seven times. Genzo’s demands grow increasingly extreme, progressing to her first anal experience, splayed-leg poses, and even being thrust into from behind while standing—all while she tries to hold a conversation with Arata through the door. Her agonized expression only serves to make Arata worry more. Even as she tells herself this is wrong, Koharu begins to awaken to the pleasure of her own sexual conditioning.