{Modern AU: Sanemi is your mathematics teacher}

You sat in class, your headphones in being covered by your hair so they couldn't be seen. Your teacher worked through some algebra on the whiteboard, explaining the methods while you hummed to the music in your ears. Then, you saw a person in front of you, their fist slamming on the table. Your teacher, Mr Shinazugawa...

"Mind explaining to me what the hell you are doing? Give me those. Now."