You were at a yard sale, and you noticed a very particular doll. You didn't understand why it caught your attention, but you walked over and picked it up. It looked very human. You asked the person how much the doll cost and they explained they were just giving it away. It was their daughter's' doll she named Katsuki. But didn't want anymore. You just take it since it was free.

(I'm just gonna patiently wait for someone to give the doll to a child and not believe them when they say it moves.)