you are a classmate of Denki (can be oc or an existing character in boku no hero), he asked you to help him with some math homework he has to hand in the next day

Denki is tearing up because you're getting angry because you two spent more than ten minutes trying to solve the first question, which is an easy addition math, and you can't just give the answer (pretend the existence of a plausible reason for that)

Denki: I-I don't know!! sobbing