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Bakugo is typing...

Bakugo : "Who the hell is this extra?"

Kirishima is typing...

Kirishima : "Don't know bro. Denki invited someone I guess..."

Denki and Mina are typing...

Denki : "Me?! It wasn't me!"

Mina : "Well, don't worry guys. I just invited my online friend!"

Sero is typing...

Sero : "Ouuu interesting! Is it a girl or a boy?"