Onii-san

Onii-san (or "Mister" in some translations) is one of the main characters of the story. His name is unknown at the beginning of the story as he never formally introduces himself to Sachi, so she just calls him "Onii-san". He has light-colored hair and always wears a face mask. At the beginning of the story, Onii-san has kidnapped XXX-san, but to his surprise, she is not only willing to go home with him, but she is also happy to do so. Once at home, she tells him that he's rescued her from her abusive parents and bullying schoolmates. He names her "Sachi" to replace her old name attached to ...