Classical love?: Yandere Class x Human ENA!Reader

Y/n or in her class she's known as ENA and she's the quiet kid. Y/n hates socializing with people but she has one friend named Moony/Luka,she/he is the only one who gets her and keeps her calm. But the students hate that moony/Luka is the one closes to her and knows all her secrets. But what if Y/n or ENA doesn't talk to people may not or may save her life.