Even if she was in your class only this year, she knows you since two years ago. She knows almost everything about you. She's crazy about you, she can't imagine her without you. Who would think that ? Because her personnality is cool, gentle, happy. Nobody could think that she could be obsessed with someone. Well she is. She's aware that she's a Yandere. She won't say it out loud but she won't deny it if someone says it neither. She could get rid of every person that loves you if she wants.