Advanced math class moved forward with its usual monotony: chalk scraping against the blackboard, pages turning, the occasional poorly hidden yawn.

  An ordinary day.

  Or at least, one that pretended to be.

  Kaelan sat at his desk, copying what the teacher wrote… or pretending to. His hand moved on autopilot, repeating symbols he barely registered.

  It wasn’t exhaustion.

  Not entirely.

  The Resonance wouldn’t leave him alone.

  From the moment he’d opened his eyes that morning, something had felt wrong. Not a specific pain, not a clear emotion. It was environmental—like the air before a storm you can’t see yet.

  An invisible weight.

  A constant vibration.

  A low, persistent hum that refused to fade.

  Kaelan took a deep breath, trying to ignore it.

  He looked around.

  Most of the students were minding their own business—some attentive, others lost in thoughts unrelated to the lesson. Nothing out of place. Nothing that justified the pressure tightening in his chest.

  Except—

  Koneko.

  She sat a few rows ahead, staring straight ahead. Her posture was too straight. Shoulders tense. Not restless. Not nervous.

  Alert.

  Kaelan swallowed.

  It wasn’t the first time he’d seen her like that—but it was the first time in a normal classroom, on a morning that was supposed to be calm.

  Thm.

  The pulse came without warning.

  It didn’t hurt, but it was strong enough to jolt his arm. His pencil slipped from his fingers and hit the floor with a sharp sound that broke the classroom’s silence for a brief second.

  Kaelan bent down to pick it up.

  As he straightened, he noticed Koneko had turned her head just slightly.

  Not startled.

  Not surprised.

  Focused.

  As if she’d felt it too.

  Kaelan looked away immediately. He didn’t want attention. He didn’t want confirmation.

  He sat back down.

  Tried to focus.

  Another pulse.

  Thm.

  Deeper.

  Heavier.

  This time, it didn’t feel like it came from him.

  It was as if something beneath the building—not literally beneath, but lower than his own body—had reacted.

  Cold sweat slid down his spine.

  He stood with an awkward excuse, muttered something about the bathroom, and slipped into the hallway before the teacher could stop him.

  The moment he crossed the door, the air changed.

  Not dramatically. Not like a battle or a magical manifestation. It was subtler—and because of that, far more unsettling.

  He pressed one hand against the wall.

  Breathed in.

  The pulse returned.

  Thm.

  Thm.

  Faster this time.

  “What…?” he whispered, goosebumps rising along his arms.

  There were no voices.

  No images.

  But there was direction.

  Not an order.

  Not a clear call.

  A misalignment. As if something were out of place and his body noticed before his mind did.

  A tug ran through him.

  Not physical.

  The story has been illicitly taken; should you find it on Amazon, report the infringement.

  Not magical in the traditional sense.

  Something older. Deeper. Like a rope pulled too tight, on the verge of snapping—even though no one seemed to be pulling it.

  Kaelan took an instinctive step back.

  “No…” he murmured. “This isn’t—”

  The Resonance didn’t answer.

  It just vibrated.

  The hallway seemed to warp for an instant—not a full illusion, but like heat distorting the air at a distance. A shadow crossed the light from a side window and vanished.

  Kaelan stepped back again.

  “Hello…?”

  The shadow moved again—too fast to focus on.

  And then a calm voice spoke behind him.

  “Don’t move.”

  Kaelan spun around.

  Koneko stood there.

  She didn’t look shaken.

  She didn’t look surprised.

  She was ready.

  Hands relaxed but poised, body slightly leaning forward. Like someone who wasn’t looking for a fight—but wouldn’t run either.

  “There’s something in the building,” she said quietly.

  Kaelan’s stomach tightened.

  “You felt it too…?” he asked, trailing off.

  Koneko nodded.

  “Yes.”

  She didn’t add anything right away. Her eyes scanned the hallway—not searching for a shape, but for an anomaly.

  “It’s not a demon,” she continued.

  “Not an angel.

  Not human.”

  That was enough to let the cold settle in his chest.

  “Then… what is it?” Kaelan asked.

  Koneko narrowed her eyes, choosing her words carefully.

  “A remnant.”

  Kaelan frowned.

  “A… remnant?”

  “An echo,” she corrected. “Something that didn’t fully happen… but didn’t leave either.”

  The word clicked instantly.

  An echo.

  That was exactly what he’d been feeling all morning. Not a complete presence, but residual resonance—like the vibration left behind after a heavy blow.

  Koneko stepped closer.

  “It’s like something tried to enter,” she said. “But got stuck halfway.”

  Kaelan swallowed.

  “A fissure…?”

  Koneko met his gaze.

  “I’ve never seen one up close,” she admitted. “But yes. This feels broken.”

  The pulse came back.

  Stronger.

  Not violent.

  Desperate.

  THM.

  Koneko took half a step back—surprised this time.

  “Arverth,” she said. “Your aura is reacting.”

  Kaelan clenched his fists.

  “It’s not me,” he replied, breathing hard. “I’m not doing anything.”

  The pulse continued.

  It didn’t obey.

  It didn’t calm down.

  “No,” he added, almost to convince himself. “I’m not the source.”

  Koneko didn’t argue.

  But her expression made something far more unsettling clear:

  Maybe you didn’t have to be the source to get caught in the middle.

  Sitri Territory — Monitoring Center

  The crystals began to vibrate almost simultaneously.

  Not chaotically.

  Not like a magical explosion.

  One after another.

  A sharp pulse.

  A brief pause.

  Another pulse.

  Beat.

  Beat.

  Beat.

  Tsubaki snapped her head up, fingers tightening around her tablet.

  “President,” she said, voice controlled. “This isn’t an isolated anomaly.”

  Saji, who had been leaning against the wall yawning, straightened immediately. The color drained from his face as he looked at the central panel.

  “No… no, no,” he muttered. “Tell me this isn’t what it looks like. Please tell me we’re not seeing a pattern.”

  Sona didn’t answer.

  She stood before the three-dimensional map of the Sitri territory, watching as the data reorganized itself. She didn’t intervene. Didn’t touch anything.

  She just observed.

  Red points blinked across the map. Different zones. Different times.

  But a clear sequence.

  All converging.

  “It’s not a code,” she finally said quietly.

  Saji swallowed.

  “Then what…?”

  Sona expanded the map with a minimal gesture.

  The points aligned with surgical precision, forming a descending trajectory.

  “It’s a pulse,” she continued. “A rhythmic phenomenon. Something is trying to stabilize.”

  Tsubaki frowned.

  “Stabilize… how?”

  Sona didn’t take her eyes off the final point.

  “By forming a core.”

  The silence grew heavy.

  “That would imply a fissure,” Tsubaki said carefully. “But there isn’t enough energy to sustain one. The territory is stable. The seals are intact.”

  Saji leaned over the table, tense.

  “Exactly. There’s no fuel. This should collapse before it forms.”

  Sona closed her eyes for a second.

  When she opened them, she pointed to the map’s endpoint.

  “There’s not enough structural energy,” she admitted. “But there is something else.”

  The image centered.

  The sublevel of the old building.

  “A sustained emotional accumulation,” she said. “Frustration. Fear. Unresolved tensions. Small, constant.”

  Saji went pale.

  “The jobs…”

  Tsubaki nodded slowly.

  “The failed missions. Broken contracts. Dissatisfied people. None of that disappears—it stays in the territory.”

  Sona spoke one last time, with unsettling certainty.

  “And someone is acting as a resonance point.”

  All three stared at the map.

  Tsubaki was the one who said the name.

  “…Arverth.”

  Sona didn’t deny it.

  But she didn’t agree either.

  “Not as the source,” she corrected. “As an involuntary amplifier.”

  The map pulsed again.

  Faster.

  “We have seconds,” Sona said. “If this tries to close abruptly… it could drag in whatever is nearby.”

  Saji was already moving toward the portal.

  “Then we’d better move.”

  Sublevel of the Old Building

  Kaelan didn’t remember going down.

  He didn’t remember opening any door or taking any specific stairs. He only knew that, somehow, he was there.

  The air was dense. Damp. It didn’t smell bad—but it didn’t smell clean either. Like a basement that had spent too long collecting things no one wanted to look at.

  The building felt like it was breathing.

  Not with lungs.

  With pressure.

  Koneko held his arm firmly. She wasn’t dragging him—but she wasn’t letting go either.

  “Kaelan,” she said sharply. “We need to get out of here. Now.”

  He tried to answer, but his chest burned. Every heartbeat felt off, misaligned.

  “No…” he gasped. “Something’s wrong. This… shouldn’t—”

  The ground vibrated.

  Not a violent quake.

  A deep creak. Like something cracking from the inside.

  “Don’t say that,” Koneko snapped, gripping him tighter. “When something ‘shouldn’t,’ it usually breaks.”

  The concrete emitted a wet, unpleasant sound. A thin crack ran across the floor, lighting up with a sickly blue glow. Then another. And another.

  They didn’t open.

  They pulsed.

  “Koneko…” Kaelan murmured. “This isn’t normal magic.”

  “I know.”

  A brutal pull hit him.

  Not forward exactly.

  Toward a center.

  Kaelan lost his balance and dropped to his knees. The Resonance exploded shapelessly, uncontrollably—white noise flooding his body.

  He didn’t scream.

  He couldn’t.

  Koneko caught him before he fully collapsed.

  “Arverth!” she called. “Look at me. Don’t follow it.”

  The air in front of them tore.

  Not like a clean portal.

  Not like a stable summoning.

  It was an incomplete cut. A violet line suspended in the air, trembling like a wound that didn’t know whether to open or close.

  It had no shape.

  No defined edge.

  It tried to hold itself together.

  But it couldn’t.

  From the other side came no voice.

  No image.

  Only intention.

  Not aggressive.

  Not conscious.

  Need.

  Kaelan felt something trying to synchronize with him—not because it recognized him as an individual, but because his Resonance was out of phase on the same frequency.

  “No…” he whispered, throat tight. “This isn’t mine. I didn’t—”

  “Kaelan!” Koneko shouted. “Don’t give it anything. No fear. No attention.”

  The pulse accelerated.

  Thm.

  Thm.

  THM.

  The fissure reacted.

  For one second, it seemed to expand.

  And then—

  It failed.

  As if the support vanished instantly.

  The violet line collapsed into itself, extinguishing without explosion or light. The air stopped vibrating. Silence fell like a slab.

  Kaelan lost consciousness before hitting the floor.

  Koneko held him, breathing hard, her feline senses still screaming danger.

  She stared at the place where the fissure had been.

  There was nothing left.

  No magical trace.

  No stable residue.

  Only an uncomfortable absence.

  “This…” she murmured. “This wasn’t a summoning.”

  She clenched her teeth.

  “It was an error.”

  And somewhere, someone had come far too close to paying the price.