https://www.pixiv.net/member_illust.php?mode=medium&illust_id=55772186

Ok, let make a guess, her mother was killed in accident, other female kids bully her, she wanted to cut her wrist but could not do it so she took a knife stab through stomach of a friend dude to get prison for free meal and don't have to care about bully.

Base +8, Rochesa -8

Her mom dead in a traffic accident and her right hand was transplanted from her Mom so it is little bit longer than Left hand. Due to this she was being bullied in school and tried to suicide. She failed to do so as her Mom's spirit live inside the right hand. Now she get a happy life and boy friend, but in fact he is the driver who hit and ran so her right hand kill him unconsciously.

Base +12, einhers +12