"You always try to seduce me with your big ass. What are you trying to do?" Waka is suddenly attacked from behind by her socially awkward and reclusive brother-in-law who accuses her of being a complete slob. Waka is so scared of her brother-in-law's insane behavior that she can't move, and he grabs her ass and rapes her from behind. After that, despite her dislike for him, her young and beautiful body responds, and her ideal married life slowly begins to fall apart...