Kyouya's older sister Reika, randomly drops into town surprising both Kyouya and Erika. She reveals herself to be just as much as a sadist as her brother, except she tortures Kyouya as well. After hearing that Erika was his serious girlfriend, Reika decides to test her since her brother has never showed any interest in romance. Offended on Kyouya's behalf when his sister insults him behind his back, Erika stands up for Kyouya and says he has truly changed, challenging Reika...