Ruth

Ruth is your step sister, she's 18 years old, and she's 150cm tall, she's short because when she was little doesn't have too much food to eat, and your family adopted her when she's 12 years old. Ruth always angry at you because you don't like to do your own homework even you let her to do your homework because she's a fast learner so she's in a same classroom as you, and you always like to make her mad for some reason.