The crime scenes told him things they couldn't tell anyone else.
Rias drove them to the first location in a black car that moved through Kyoto's streets with the smooth authority of money. Nobody spoke during the ride. The peerage sat in the formation Ryuu was beginning to understand as instinctive: Kiba and Koneko flanking the exits, Akeno relaxed but alert, Issei pressed against the door like he was trying to become smaller.
They stopped at a residential street in Fushimi, south of the city center. The building was a narrow apartment block, five stories, gray concrete. The scaffolding around it was damaged. Ryuu could feel it from the car, the same shredded quality he'd sensed at the scorched gap between buildings in Kuoh Town. Something had torn through the invisible lattice of this place and left the edges ragged.
"Third floor," Rias said. "Apartment 304. The victim was a woman, twenty-six, who worked at a bookstore. She had low-level spiritual sensitivity. Could see ghosts. Had never interacted with any faction."
They went up. The apartment had been sealed with a ward Rias disabled at the door. Inside, it was small and clean and ordinary. Books on shelves. A futon rolled in the corner. A kitchen with dishes in the drying rack.
No body. Rias had already had that taken care of.
But the scaffolding screamed.
Ryuu stood in the center of the living room and let his deeper sense open. The lattice here wasn't just torn. It was rewritten. Sections of the invisible structure had been altered, changed, their fundamental properties modified in ways that the original architecture couldn't accommodate. The result was a kind of structural scar, the lattice trying to heal around changes it didn't recognize, producing distortions that cascaded outward in slow, expanding waves.
"You see something," Rias said. Not a question. She was watching his face.
"The structure here has been edited," Ryuu said. "Not damaged by force. Edited. Someone changed the rules governing this space and the changes killed her."
"Edited how?"
He crouched and pressed his palm flat against the floor. The distortion was strongest here, radiating outward from a point near the center of the room. He closed his eyes and felt.
The property that had been changed was biological. Something related to the woman's body, to the physical laws governing her cellular structure. It had been altered at a level so fundamental that the change was indistinguishable from a natural failure. Her cells had simply stopped knowing how to be cells. Not destroyed. Not attacked. Just... rewritten. As if someone had reached into the code that defined what a human cell was and changed one variable, and the cascading failure had done the rest.
Ryuu opened his eyes. His hands were shaking.
"She didn't feel pain," he said. "She just stopped working. Like a machine that someone changed the programming of while it was still running."
The room was silent. Rias's expression was careful, controlled, but he could see the tension along her collarbone, the way her shoulders had drawn slightly inward.
"That's consistent with the autopsy," she said. "Massive, simultaneous organ failure with no identifiable cause. Every cell in her body appeared to have undergone a fundamental change in function at the same moment."
Ryuu stood. "This isn't like what I can do."
"It left no trace."
"The mechanism is similar. It operates on the scaffolding, on the underlying rules rather than on the surface. But what I do is temporary. Targeted. I can erase a property, but it comes back. This is permanent. Whoever did this rewrote a law of nature within this apartment and the change stuck."
"Tier II," he thought, but didn't say. The Codex had shown him the hierarchy. Tier I runes were temporary. They imposed changes that faded. Tier II was different. Permanent inscription. Changes that remained after the rune's activation ended.
Someone out there had Tier II capabilities. Or something equivalent. Something that could do what the Codex did but without the Codex.
They visited the other two sites. A man in Uji, thirty-one, mathematics teacher, found dead in his classroom after hours. A teenager in Otsu, sixteen, artist, found in her studio surrounded by canvases that had been altered in ways that matched the scaffolding damage. In each case, the same pattern: surgical, permanent rewriting of a fundamental property, zero trace, instant death.
By the time they returned to the shop, it was past midnight. Rias dismissed the others with a look, and they dissipated into the night, Kiba and Koneko vanishing into shadows, Akeno stepping through a small magic circle, Issei walking toward the train station with the dazed expression of someone still adjusting to a world he hadn't known he'd joined.
Rias stayed.
She sat in the customer chair while Ryuu made tea. The shop was dark except for the lamp behind the counter, and the amber light made the space between them feel smaller, more intimate, more honest than daytime would have allowed.
"You know more than you're telling me," she said.
Ryuu poured the tea. Set the cup in front of her. Sat on the stool behind the counter.
"I know the system that's being used," he said. "Not the user. The system operates on principles I'm familiar with because I study them. But what I study is the basic level. The foundation. What this killer is using is the next floor up."
"There's a hierarchy."
"Four levels. I'm at the first. The killer is at the second, at least."
Rias held the teacup in both hands but didn't drink. "And what's at the top?"
"I don't know yet. The source material doesn't reveal itself all at once. It opens in stages, based on what you've earned the right to understand."
"Source material." Her eyes sharpened. "An artifact. A text."
He'd said too much. Or exactly enough. The line was hard to see.
"If I tell you what it is, you'll want it," Ryuu said. "And if you want it, you'll have to decide whether wanting it is worth changing the nature of our arrangement."
"I don't want your artifact. I want to stop whoever is using a similar power to kill people in my region."
"Then we work with what I can give you. I can read the damage at the crime scenes. I can follow the distortions in the scaffolding. I might be able to track the source, but it'll take time. This person is careful. They clean up after themselves, not physically, but structurally. They repair the scaffolding damage after each kill. I can only read it because the repairs aren't perfect. There are seams."
"How much time?"
"Days. Maybe a week. I need to study the pattern. Each site has a slightly different signature, like handwriting variations. If I can identify the consistent elements, I can build a template. And a template can be tracked."
Rias drank her tea. The cup looked small in her hands, ordinary and human, and for a moment she didn't look like a devil or a heiress or a territorial commander. She looked like a tired young woman sitting in an antique shop at midnight, drinking tea made by someone she barely knew.
"You're studying this thing every day," she said. "Your source material."
"Yes."
"And each time you study it, you unlock more."
"Yes."
"And the cost?"
The question landed precisely where it was aimed. Ryuu looked at her across the counter and saw that she'd already calculated the trajectory. Power at a cost. Escalating returns, escalating expenses. The basic economics of the supernatural applied universally.
"At this level," he said, "headaches. Nosebleeds. Focus degradation. Recoverable."
"And at the next level?"
He paused. "I don't know yet. I haven't earned the right to know."
Another truth wrapped in an evasion. The Codex had shown him glimpses. Tier II costs were physical. Degradation measured in hours. Pain that lingered and changed the body. He knew this the way he knew the runes, in fragments, in outlines, in the structural understanding that the Codex imparted before the full picture came clear.
"Be careful," Rias said, and the way she said it made him look at her more closely. It wasn't the caution of a commander assessing an asset. It was the concern of someone who had watched people she cared about pay prices for power and didn't want to watch it again.
"I will," he said.
She left shortly after. The shop door closed with the bell's soft ring, and Ryuu stood alone in the amber light and finished his tea and thought about the three dead sensitives and the invisible killer operating with power one tier above his own.
He went to the back room. Opened the Codex.
The pages that dealt with Tier II had been opaque for weeks. Dense symbol clusters that his deeper sense couldn't penetrate, locked behind the wall of understanding he hadn't yet climbed. But tonight, sitting in the dark with the residual impressions of three crime scenes fresh in his awareness, the wall was thinner.
He could see through it. Not clearly. Not well enough to grasp. But the shapes behind the wall were resolving, and among them, he could see the outline of the first Tier II rune.
Exchange. Trading one reality for another.
He closed the book before the pressure became too much. The headache was already building, a slow wave that would crest in an hour and leave him useless for the rest of the night.
He lay on his futon and stared at the ceiling and thought about the difference between what he could do and what the killer could do.
The gap was one tier. One level of understanding. One floor of the building.
He needed to climb.
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