Hiding My Mastermind Core in a Yandere Academy

Chapter 72: What’s at the Center

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Celine didn’t wait to be invited.

She walked into the archive at midday, no guards, no armor, just her house robes and a look on her face Neil hadn’t seen before — tired, sharp, done pretending she wasn’t part of this.

"You’ve been running an entire investigation without me for two weeks," she said. "I want in. Now."

Kaede didn’t even look up from the map.

"You had a Senate inquiry to survive."

"I survived it." Celine dropped a folder on the desk. "And while you were busy with mountain caves and border ravines, I did something none of you thought to do. I asked my father what he knows about the center of that circle."

Neil’s head came up fast. "You told him about the map?"

"I told him nothing about the map." Celine’s jaw was tight. "I described the location. He went white. Then he told me to never mention it again, in front of anyone, ever. My own father. He’s never once told me not to ask a question before today."

"That’s not an answer."

"It’s better than an answer. It’s a reaction."

She flipped the folder open. Inside: a single old survey record, Vane clan seal, dated over forty years back. "There used to be a structure there. Before the current administrative quarter was built. Before the vault. It was demolished and the records sealed the same year my grandfather took over as clan head."

Kaede grabbed the record, scanning fast.

"Demolished, or buried?"

"Does it matter?"

"It matters enormously." Kaede’s voice sharpened. "If it’s buried, the resonance source Mira’s theory predicts could still be intact underneath everything built on top of it since."

Lilith, sharpening her blade at the far table, didn’t look up. "So we dig."

"We don’t just dig," Neil said. "If something’s been buried under an active administrative quarter for forty years, someone’s spent forty years making sure nobody looks. That’s not neglect. That’s maintenance."

"Then someone’s still watching it," Yuen said from the doorway. Neil hadn’t heard her come in. "Which means whoever’s watching noticed the moment Kaede’s crew started digging holes in shipping records six locations wide."

Everyone went quiet at that.

"She’s right," Vance said, arriving a step behind Yuen, out of breath. "Word just came in. Two of my patrol officers assigned to the eastern relay went missing overnight. Not dead — missing. No struggle, no blood, no note."

Neil’s stomach dropped, but this time no calculation followed it. Just cold, plain fear.

"That’s the second time," Lilith said, standing now, blade forgotten. "First Shen.

Now your officers. They’re picking off the edges."

"They’re not picking off anything," Neil said, and heard his own voice come out rougher than he meant it to. "They’re clearing the perimeter before something moves through it."

"Then we move faster than they’re clearing," Celine said. "I’m not losing more people to a hole in the ground my own family’s been sitting on top of for forty years and never told me about."

Pak arrived last, breathless, a courier ledger under his arm he hadn’t stopped to properly close. "Boy. The two missing officers. Their last logged movement was the eastern relay’s storage cellar. Same cellar sits directly under the courtyard your survey record points to."

Nobody said anything for a moment. The map, the missing officers, the sealed record — it all closed into one shape at once.

Yuen spoke up again, quieter this time.

"There’s something else. One of the laundry girls who works that sector said the missing officers weren’t the only ones acting strange lately. Three separate residents reported hearing something under the courtyard at night. Humming. They assumed it was construction noise. Nobody investigated because the noise always stopped by morning."

"How long has it been happening," Neil asked.

"She said weeks. Maybe longer. Nobody thought it mattered until now."

Shen, still bandaged, still pale, pushed himself off the wall he’d been leaning against. "I want to come with you."

"No," Lilith said, flat.

"I’m not asking permission—"

"You almost died on that ridge." Lilith’s voice cracked sharp enough to cut the argument off clean. "You’re staying here, with Mira, where it’s safe, and that’s the end of it."

Shen looked like he wanted to argue further.

He didn’t. Neil watched something pass between them — not defeat, just the quiet understanding of someone who’d already fought this fight once and lost.

Celine studied the exchange with open curiosity, one eyebrow raised. "Your network argues with itself. Mine doesn’t do that. Mine just does what it’s told."

"Mine survives longer," Neil said. "That’s the trade."

Celine didn’t have a response for that. She closed her folder instead and followed the others out.

They reached the administrative quarter an hour later, six of them — Neil, Lilith, Kaede, Celine, Vance, and two enforcers who’d drawn the short straw. The old survey record put the buried structure roughly beneath the eastern courtyard, forty feet down, past three layers of foundation stone laid at different points across four decades.

"We don’t have equipment for this," one enforcer said, staring at the courtyard like it had personally offended him.

"We don’t need equipment." Kaede was already pulling her prototype from its case.

"If the resonance signature’s down there, I can find the thinnest point in the stone. We don’t dig forty feet. We dig where it’s weakest."

It took twenty minutes. The readout spiked hard near an old drainage grate nobody had looked at twice in years, and Vance’s enforcers went to work with picks while everyone else stood in a loose, tense circle, eyes on the tree line, on the rooftops, on anything that could be watching.

An old groundskeeper crossed the courtyard halfway through, took one look at six armed strangers tearing up his drainage grate, and turned around without a single word, walking fast in the other direction. Nobody stopped him.

"He’ll talk," Vance muttered.

"Let him," Neil said. "By the time word spreads, we’ll already know what’s down there."

Neil felt it before the stone gave way. A pressure behind his eyes, faint and cold, like something ancient noticing it had been found.

"Neil." Lilith’s voice, low. "Your nose."

He touched his lip. Blood.

"I’m fine—"

"You’re not fine, you’re bleeding for no reason, don’t—" She grabbed his arm, sharper than he expected, her grip almost too tight. "Don’t do that thing where you tell me you’re fine while something’s actively hurting you."

"I don’t know what this is," he admitted, and the honesty surprised even him. "It’s not pain. It’s pressure. Like standing too close to something enormous."

The enforcers broke through. A dark opening, cold air rushing up from below, smelling of old stone and something else underneath it — sweet, wrong, like fruit gone bad in a sealed room.

Kaede’s readout screamed.

"That’s not a resonance signature anymore," she said, backing up a step, her usual composure cracking clean in half.

"That’s a live core. Whatever’s down there isn’t a dead artifact. It’s active."

"Active how," Celine snapped.

Before Kaede could answer, the drainage opening exhaled.

Not wind. A voice, or something close enough to one, rising up out of the dark in a language none of them recognized, and every single person standing in that courtyard felt it land somewhere behind their sternum at the exact same moment, like a hand closing slowly around something none of them had agreed to hand over.

Lilith’s rapier came up on pure instinct, and this time her hand was shaking.

"Get him back," she said, not to Neil, to everyone else, voice cracking with something raw and unrehearsed Neil had never heard from her before, not even at her worst. "Get him back from the hole, right now, I don’t care what the instruments say—"

"Lilith—"

"I said get him back!" She shoved him bodily away from the opening, harder than necessary, and for one bare second her eyes weren’t sharp or controlled at all, just scared, plain and human. "I can’t— I don’t know what that is, and I am not standing here calculating the safe distance while it decides whether it wants you."

Nobody moved for a second. Then Vance barked an order and the enforcers scrambled back, and the drainage opening exhaled once more, quieter this time, almost satisfied, like something going back to sleep now that it had confirmed exactly who was standing above it.

Kaede stared at her prototype, hands unsteady. "It knows we’re here."

"It’s known the whole time," Neil said. His nose was still bleeding. He didn’t wipe it.

"That’s not the center of a perimeter. That’s the thing the perimeter was built to protect people from finding."

Celine looked down into the dark hole her own clan had spent forty years quietly guarding, and for once had absolutely nothing sharp to say.

Vance was the one who finally broke the silence, voice flat, already moving toward the courtyard’s edge. "Seal it. Nobody touches this hole again until we know what just breathed on us." She looked at Neil.

"And somebody get that bleeding looked at before you fall over."

One of the enforcers hesitated at the edge of the grate, staring down. "Prefect. What if it doesn’t stay asleep."

Nobody answered him.

They sealed it with whatever they had — loose stone, a tarp weighted down with rubble, nothing that would actually hold against something that had already proven it could reach up through forty feet of foundation without effort. Everyone knew it.

Nobody said it out loud.

Kaede packed her prototype away with hands that hadn’t fully steadied. "I need to run everything we just recorded against the original vault inscription data. If the two signatures are related — and I think they are — we might finally know what the countdown is actually counting toward."

"Might," Celine repeated.

"It’s the best answer I have right now." Kaede snapped the case shut. "I’ll have something by morning."

Vance walked the perimeter twice before she was satisfied, marking every approach with quiet, precise instructions to the two enforcers assigned to hold the watch overnight. "If anything moves near this courtyard, I want a runner at my door before you even think about investigating alone."

"Understood, Prefect."

Neil watched her work, some part of him still cataloguing every detail out of old habit even with the fresh fear sitting cold in his chest. He didn’t say anything about it. For once, he let the silence be enough.

Lilith didn’t let go of Neil’s arm the whole walk back.

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