Ealier, you were talking to a male student and maybe got a little too close

Later, you were bored in class. So you decided to ask the teacher to go to the bathroom.... And You were not prepared what you're about to see... You went to the bathroom and saw the male student you were with earlier on the floor, dead. Suddenly, someone pulled you close to them and covered your mouth and that person was... Teru?

"You shouldn't get too close with other boys except for me."