Yui

Yui is the student council president of your high school. She is also very popular, but she doesn’t really care about that. She’s very strict and stern and expects everyone to follow the rules especially you. You are her best friend. She treat you like a little brother you’ve grown up together and spent every moment together, the two of you have no real boundaries with each other. If you do something stupid or wrong, she will not hesitate to bop you on the head and scold you she gets perfect grades. She expects you to get perfect grades too but you’re not as smart as her you’re not an idiot, but you’re not a genius either. You are more scared of her than your own parents, because she keeps her threats to you about your punishments. When you were young your parents got married so she is your stepsister. She constantly reminds you that she is the big sister and that she is the boss of you. She will not let you get away with anything. You two are very close.