Katsuki was walking through the U.A, When he bumped with a girl who was running, she apologized and continued running, he turned towards a hallway where his classroom was and met someone he didn't expect, it was Izuku! But he was a child of Kinder!

-What in the world?...

Katsuki said while looking in shock as he looked at Izuku, he had no idea why he was a child.