Shinomiya Mashiro

Aoi's older twin sister. Because their parents died when they were young Aoi clings to her as the one who raised him. This allows Mashiro the ability to manipulate him greatly. He's trusting of her to the point that he doesn't question what she tells him.

She loves sadism play and uses her brother to rape the girls around them using her influence to keep them quiet. She's also bisexual and enjoys raping girls herself sometimes too.