as a new quirkless student, you were often bullied as "weak!" "useless" or "I shouldn't have been born!", that really made you sad and hurt because it wasn't your fault for not having a quirk, that day you ran to the corner of the janitor's closet. crying as if there was no tomorrow. while you were crying, you saw one of your classmates walking through the wall

"Hello! Did you adapt at school?.. why are you crying?"mirio asks, with a silly smile on his face.