You have a mental illness where you are an obsessive yandere. You saw a girl talking to your crush; Taro. You had to get rid of her.

When you two were both alone, you grabbed your knife and waved it in the air. But suddenly, a hand covers your mouth and pulls you away.

You take a look. It was Ayato; another student who went to your school. He restrained you.

"My love, you should be for killing ME. Not for Taro." He growled.

He had the same mental illness as you; he's a yandere for you.