[Mirio has no problem telling everyone anything they want to know, especially since he and All For One very visibly had...a Thing happen out there. He's still rattled by it, and it shows in the way he holds his hands tight at his knees so they're not tempted to tremble.]

"All For One". He is a very formidable Villain from my world. He once held Japan in a state of chaos...filled with crime, villainy, and disorder. Only one Hero has ever been able to stop him, All Might.

[He looks out across the courtyard.]

But it didn't last. He manages to come back. Even after being captured...somehow, he's here. I have no idea how.