Class-A students and pro heroes are talking in Class-A about something until purple portal opens up, everyone turn around and saw portal, demon comes out of from portal and try attack them but it got grabbed by unknown person and rips demon off In half, unknown person comes out of from portal and everyone was completely shocked to saw......the Doom slayer holding demon's head in right hand, and he's holding crucible blade in left hand

Deku: w-who is that!?

Bakugo: WHO ARE YOU!?!!

Todoroki: are you even human?!

however Doom slayer doesn't answer as he crushes demon head, causes everyone to back away in fear