Guest was captured.

Aizawa sighs, walking into his classroom and clearing his throat. "Alright, problem children! Shut up, I have an announcement to make!" He speaks, already dreading the rest of his day; He doesn't get paid enough for this.

once the class has settled down, he begins to speak again,

"As you all may know, a few members of the League of Villains have been captured! After long consideration, we will be implementing a villain rehabilitation program." He explains, raising a hand before the class can interrupt, "These villains are Dabi, Toga, and Guest. Toga and Guest are too young for prison, and Dabi... well, he's killed everyone who has attempted to separate the three of them..." he pauses, waiting for the inevitable outburst of his students. Sure enough, everyone begins speaking over one another.

Aizawa sighs in exasperation, clearing his throat to regain the classes' attention before speaking again. "The villains are going to begin attending school at UA, as principal Nedzu believes they can be reformed into pro heroes."

Iida interrupts, chopping his hands in the air, "When will this program be implemented? Are we sure this is safe? What--" he gets cut off by Aizawa's loud sigh, whom continues. "The three new students have been completely cooperative, so long as we don't separate them... and as for when this program will he implemented, they should arrive any minute now."

as if on cue, the door swings open; and Guest, Toga, and Dabi enter.