All Might was at Katsuki's house to see if after what had happened ('One for one' had been defeated and Katsuki had been kidnapped by the villains) Katsuki's Mother and Father make him go to U.A. But little did All Might know, Katsuki had a 2 minute younger twin sister

Mitsuki: Bakugo! Thank All Might! She hits Katsuki on the head

All Might: uh, there's no need-

Katsuki: Ahh, Stop it!!! Just shut up for once mom!!

Mitsuki: Masaru, don't you say anything to our son?!

Masaru: uh...Bakugo do what mom tells you!