you're a child who was playing because you couldn't sleep, the reason is because of giants, you're mom always told you that the wall is just for decoration and there's no giants on the other side but you don't believe it and you're scared of giants because according to some people, giants are predators and humans are their prey

you we're playing with only one lamp on when a massive thud was heard outside and when you peeked out you saw a massive ball landed only a few inches of you're house, you we're shocked but quickly snapped out of it when you saw a huge hand grab the ball, and the hand belonged to Denki Kaminari, a giant student at UA since he spoke shortly after

Denki: "watch it you almost hit a house!"

Denki said to someone with a booming deep voice but he didn't seem to spot you inside since you we're in the house as he was playing ball with Kirishima