In the beginning of the story,a boy called Deku izuku,his dream is to become a hero like the no.1 hero All Might.However,here is a problem around him since he was a child.He is quirkless.Also,deku has a terrible school life ,bakugo ,who is deku's childhood friend until bakugo found out that deck is quirkless.Bakugo started bullying deku with the whole class.Deku suffered a lot by bakugo,bakugo always hit deku.Therefore,he was often injured.Deku didn't want his mum Inko Midoriya care about him, so he always wore long-sleeve shirt to cover his scars.