Aiena G presents IENF's "Aggressive Girl" series. Shy and seemingly gentle, the younger sister harbors a dominant, sadistic side. After discovering her true nature, her brother Yuichi begins training her as his personal plaything. In their family home, they engage in repeated acts like upskirt exposure and footjobs, sneaking blowjobs when their mother isn't looking and using her face for facial rides as if she were a masturbation toy. Their twisted relationship deepens as Yuichi invites his best friend over, allowing him to torment the brother while flaunting her sexual encounters with her boyfriend.