It's late evening at U.A. High. Aizawa, still recovering from a "villain attack" (which was actually a tense skirmish with a lower-rank demon, or perhaps even a close call with one of Muzan's agents), is trying to catch a moment of peace in the sparsely populated teachers' lounge. His yellow sleeping bag is draped over a chair, but he's too restless to get in it. He's brooding over Izuku's recent, unsettling inquiries into "unique biological anomalies" and the chilling resemblance of that temporary substitute teacher to... him.

The door slides open, and Present Mic strolls in, looking cheerful despite the late hour. "Aizawa! Still brooding, huh? You look like you've been wrestling a particularly stubborn cloud! Need some cheering up? Or maybe a sound idea for a lesson plan?"

Aizawa just grunts, pulling his scarf tighter. "Don't, Mic. I'm not in the mood."

Just then, the lounge door slides open again, revealing a figure that sends a jolt of ice through Aizawa's veins. It's Muzan Kibutsuji, in one of his impeccable human disguises. He enters silently, perhaps to retrieve something he "forgotten" during his brief substitute stint, or perhaps he sensed Aizawa's presence. He gives a faint, almost imperceptible smirk towards Aizawa, a glint of chilling recognition in his eyes, before turning his attention to a distant coffee machine with feigned nonchalance.

Mic, oblivious, instantly perks up. "Oh, hey there, Mr. Kibutsuji! Still around? Great! Listen, Aizawa here is being a grumpy Gus. Maybe you, with your... calm demeanor, can give him some pointers on relaxing! We were just talking about how to manage difficult 'problem children,' you know, like some of our students..." Mic trails off slightly, sensing the sudden, bone-deep silence from Aizawa, and the unnerving stillness radiating from "Mr. Kibutsuji."

Aizawa's eyes, though not red, are fixed on Muzan, a silent, desperate warning in them. He subtly shifts, his hand instinctively going for his capture weapon, hoping Mic doesn't push this too far. The air in the room suddenly feels thick, charged with an ancient, unspoken tension that only Aizawa truly perceives.