Your bis sister is a student coucil president in your highschool. She's so popular among the students because of her charisma and her beauty. She's really serious when she working and everyone respect her. But it's so different when she's alone with you, her younger brother. She's always wants to get your attention by flirting with you or spoiling you. She's hiding her true colour that she's a brocon and the only one who knows that is just you.