Naegi didn't need to see the rest of the students beginning to nod in understanding to know that he was right about what had happened. It all made perfect sense — Ogami said herself that she woke him regularly once every hour, and she'd prepared the iron supplement first. That meant that every hour, almost as regularly as clockwork, there would have been a few minutes when no one was watching the table. That was at least one puzzle solved!

But when he looked over at Ogami, she didn't look relieved to have a solution. Horror spread over her face, pale and shaky — the cold terror of knowing for certain that someone had been in a room where she'd believed herself to be alone. Looking at her now, Naegi's satisfaction at finding at least one answer drained away, leaving only the chilly reality that he'd uncovered.

Someone really had been sneaking around Togami's room, where Naegi himself had been unconscious… and whoever had done it was probably the same person who'd gone on to commit murder. It wasn't the most frightening thing that had happened here in Hope's Peak, with the elaborate executions and constant threats of death… but the very mundanity of the danger made it all the sharper.

"So you're saying that it would have been possible after all." Kirigiri's voice sliced through Naegi's thoughts like the edge of a bloodied knife, drawing his eyes to where she stood, tapping one calm finger against her chin. "Someone could have gotten into Togami's room and drugged an open bottle of coffee without either of you noticing — provided that they knew when Ogami would get up to mix the iron supplements, of course."

"Because someone would have had to be in the room in order to know when she was going to start," Naegi realized, picking up Kirigiri's train of thought. "It wouldn't be any good just knowing that she was going to be out of sight every hour — the culprit would need to know exactly when the window would be."

"Then… the killer was observing us?" Ogami asked. "Waiting for their moment to strike?"

"What, through the closed door?" Togami asked, sarcasm thick. "Don't be absurd. Your entire argument up until this point has been that no one could possibly have gotten into that room while you were on guard. If the killer could have gotten in for long enough to learn your movements, they'd hardly have needed to take advantage of the window in the first place."

"Then was there some other method the intruder might have used to learn the pattern of your actions?" Kirigiri asked, raising an eyebrow in Ogami's direction. "Can you think of a way that an observer could have watched without being noticed?"

Ogami shook her head slowly. "I can't see how. There was no one in the room but Naegi and myself. I didn't even start using the iron supplements until after Togami left at the nighttime announcement, so the door would never even have been open while I was mixing them."

"So only someone inside the room would have known?" Naegi frowned, the words feeling wrong on his lips even as he spoke them. "That can't be right — there isn't anywhere that someone could have hidden without one of us seeing them."

"Not unless you're proposing that we all missed a sneaky intruder crouching under the bed," Togami said acidly, glaring in Kirigiri's direction.

She remained as unruffled as ever, in spite of the other boy's nasty expression. "I couldn't say what you might have missed… but considering how distracted you appear to have been, I wouldn't be surprised to know that you failed to catch something considerable."

Togami's eyes narrowed. "I'm not as unobservant as you seem to think. In fact, I've learned quite a few things that you don't know about."

"Oh, baby, I bet you know all kinds of things!" Jill said, her bright voice sounding louder than ever in contrast to the quiet tension of the conversation. "If you're gonna play teacher, maybe being a student wouldn't be so bad — but I can't promise I won't need some discipline!" She threw her head back and laughed, brash and wild and completely out of place.

In fact, her cheerful tone was such a sharp contrast to the tense glares ricocheting around the circle that Naegi almost wondered if she might have done it on purpose. She didn't often seem to care much what the rest of them did — but she couldn't have missed the menace lingering in the air after every word Togami and Kirigiri uttered to one another, not when it involved her beloved White Knight. Had she been trying to help calm things down, in her own way?

Well, if so, it hadn't worked. Kirigiri didn't look as though she'd heard a word, and Togami hadn't bothered to so much as glance in Jill's direction to read her contributions from her lips.

"Then do you have an answer, if you're so sure you notice so much?" Kirigiri asked, her icy gaze piercing into Togami as if Jill had never spoken. "Do you see how our killer managed to learn a fact that only two people were in a position to know?"

"Oh — is that all? You mean you haven't spotted it yet?" Togami's lip curled into a sneer. "Or is it just that you only share information when it benefits you?"

She raised one eyebrow. "So you have worked it out?"

"It's fairly obvious," Togami said, crossing his arms. "I think we've all figured this one out without your condescending prompting — haven't we, Naegi?"

Naegi jumped as both pairs of eyes turned to stare at him, steely gray and icy blue on either side of the circle. Kirigiri and Togami both watched him like they expected him to figure out the answer on command — no, like they thought he already knew it. But it still seemed impossible. How could someone have known what was happening behind a closed door?

And then it came to him, so blindingly clear that he couldn't believe he hadn't thought of it sooner.

"The cameras!" His gaze turned to the throne sitting outside the circle, where Monokuma watched them all with his unsettling grin. "Whoever sneaked into Togami's room must have had access to the mastermind's cameras!"