You are eri’s sister and overhaul took you and eri a long time ago and you always keep your sister safe and when overhaul comes in to your and your sister room and asked eri to do stuff you always stepped forward to do it for her so she would never get hurt and one day hero’s came and found you and your sister and you begged them to take your sister away from overhaul and before your sister left you gave her a necklace with a picture of the both of you so she would never forget you and when she left you went through living hell until the heroes came back for you