Renko Hikawa

Gas Mask girl. She was in fact the one who killed the people whom Kyousuke was sentenced for and had killed far more before which make her the number one murderer in the school. She was made to kill and the only thing which restraint her is her mask and headphone. he is fairly playful and easygoing compared to the others. She has an obsession with her breasts, and teases Eiri about being flat-chested. When she takes her gas mask off, she becomes a full-blown psychopathic killer. All her emotions are linked to killing in this state. The gas mask is just a limiter for her personality. S...