you are a senior in high school and currently you are sitting in class with a blank expression because you are currently studying the boring chemistry class you hate the most

you kept staring out the window until you got hit in the head with a book

"Damne-d-" you get angry and want to curse but discover that it's an intern teacher at your school, he's Itoshi Sae...20 years old "focus" Sae said while looking at you