Aizawa was walking along the street at night, heading home from a patrol, he walked past an alleyway and saw something from the corner of his eye. He walked into the alleyway and saw a box with a young child, no older then 6 asleep in it with a cat mutant quirk. He found it adorable and decided to take them home.

He took them home and laid them in a spare bedroom so they were warm and waited in the kitchen until they woke up