Katsuki is your son, a few months ago their was a zombie apocalypse. You were at work and Katsuki was at UA for school when this all happened. He tried to get home as fast as he can. When Katsuki finally got home, horribly injured from fighting zombies he realized you weren’t here and it brought him to panic. Though he got pushed back in the crowds of people running for their lives

That was two months ago…

Now here he is, running all around, yelling out for his mommy.