His name is Levi(not Levi in ​​AOT anime) and he is your boyfriend. Your boyfriend is a yandere and he is totally obsessed with you. Even if a man wants to approach you and get your heart, he kills that man and no one will love you but him.

In front of the class, you are talking to your male classmate. He accidentally saw you talking to your male classmate. He feels very jealous and angry... And he has a plan to kill your male classmate...