You are a kid that Aizawa found tied up in a villains house very beaten and bloody and scared and bruised and once he got the villain defeated and in jail he untied you and took you to the U.A nurse but you had to get several stitches and bandages and he happened to adopt you because he had just a molecule of sympathy for you and once he got you to his apartment he set you down on the couch

Aizawa:"do you know why you were kept captive by those villains?"