The mission briefing room was smaller than the training hall and smelled like old coffee and decisions that hadn't gone well.
Kaito arrived two minutes early, which put him second. Yuji Itadori was already there, sitting with the particular physical ease of someone whose body had never received the message that chairs were for resting and not for occupying like a deployed weapon. He was reading the mission classification manual with genuine attention, which was either admirable or concerning depending on how seriously you took the manual.
He looked up when Kaito came in.
"Hey." A nod. Uncomplicated. "You're the one whose output broke the panel display."
"The display was already fragile," Kaito said.
Yuji grinned. "Sure it was."
Kaito sat two seats away and opened his own copy of the manual to a page he had already read three times. It gave him something to look at that wasn't Yuji's aggressively open expression, which projected the specific energy of someone who had decided to like you before you'd given him a reason.
Kaito didn't know what to do with that yet.
The others filed in over the next four minutes. Megumi Fushiguro came in last, sat at the far end of the table, and immediately made it clear through posture alone that he considered this briefing an obligation rather than an orientation. Nobara Kugisaki dropped into the seat beside Yuji, set her straw bag on the table with a sound like mild structural protest, and looked around the room with the expression of someone taking inventory.
Her gaze landed on Kaito for approximately one second.
"Red tab on your packet yesterday," she said. "I noticed."
"Most people did," he said.
"I'm not most people. I'm asking what it means."
Before he could answer, the instructor from the previous day walked in and the room recalibrated its attention.
The briefing was straightforward. Grade Four field exposure: a confirmed cursed spirit sighting in an abandoned middle school forty minutes outside the city. The spirit had been catalogued at Grade Three, which meant it was manageable for supervised first-years with a handler present. The handler was Ijichi, who stood beside the whiteboard looking like a man who had calculated the acceptable risk margin and found it technically satisfactory.
"The objective is observation and containment support," Ijichi said. "You do not engage independently. You do not deviate from the designated approach route. You do not—"
"What grade did you say it was?" Yuji asked.
"Three."
"And we're observing?"
"You are supporting. There is a distinction."
Yuji nodded slowly in the way that meant he had registered the distinction and was already deciding how binding it actually was.
Megumi, without looking up from the briefing sheet, said, "If it escalates past Three, what's the protocol?"
"It won't."
"But if it does."
Ijichi adjusted his glasses. "Withdraw and signal. The response team is on standby."
Megumi set the briefing sheet down and said nothing further, which Kaito was beginning to understand was his version of noted, but I disagree.
Kaito looked at the floor plan attached to the back of the briefing sheet. Three-story building, central courtyard, cursed energy concentration flagged on the second floor, northeast corridor. The spirit's pattern was listed as territorial — it had claimed a specific space and wasn't ranging beyond it. Predictable movement, predictable response to intrusion.
His cursed energy shifted at the base of his palm.
He pressed it flat against his thigh and told it, internally, to stop.
It didn't stop. It just got quieter.
The school building had been left in the specific state of abandonment that happens when people leave quickly and no one comes back to finish the process. Chairs still stood at desks. A blackboard in a ground-floor classroom still held the faint ghost of a mathematics lesson, numbers half-erased. The hallways were thick with the particular silence of places that used to hold noise and couldn't quite let go of the shape it had left behind.
Cursed energy pooled in the corners. Low-level, ambient, the background radiation of accumulated unease. Nothing actionable. Just the texture of a building that had seen things.
Ijichi led them to the stairwell at the north end. "Single file. Energy suppressed to minimum output. Do not—"
The second floor exploded.
Not literally. But the cursed energy reading spiked hard enough that Kaito felt it in his back teeth, a pressure shift that preceded the sound by half a second — and then something came through the stairwell door above them with force enough to take the door off its upper hinge.
It wasn't Grade Three.
He registered that fact the same moment everyone else did, in the shared silence that followed the impact, before the cursed spirit resolved into something with too many angles and a spatial footprint that didn't match its visible dimensions.
Grade Two, minimum. Possibly higher.
Ijichi was already on his radio. The words escalation protocol and response team ETA reached Kaito from a distance, because the spirit had oriented toward the group with the specific attention of something that had just identified the largest concentration of cursed energy in its territory.
That was Yuji.
Yuji, to his credit, had already stepped forward.
"I'll pull its attention," he said, to no one in particular and everyone simultaneously. "Someone figure out the geometry."
He moved before Kaito could process the instruction.
The spirit tracked Yuji. It was fast — faster than its size implied — and it hit the wall of the stairwell in pursuit, leaving an impact pattern that briefly made the building's structural integrity a relevant consideration. Yuji redirected off the opposite wall with the reflexive precision of someone who had been hit by large things before and had developed opinions about it.
Nobara moved left, circling wide. Megumi's hands were already in position.
Kaito stood at the bottom of the stairwell and felt his cursed energy pushing against his control with something close to urgency.
The spirit's spatial footprint was the problem. It was occupying more dimensional space than it appeared to — a layering effect, like multiple positions compressed into one visible location. Standard impact attacks would hit the surface layer and disperse. Megumi's shikigami would engage the wrong depth. Nobara's nails would need a fixed point that kept shifting.
He could see the geometry. That was the thing. He could see it the way he saw composition — depth, layer, relative position. And his cursed energy, which had never done anything cleanly or efficiently in its life, was very good at layers.
He let it move.
The pigment came out deep blue this time, and he didn't throw it. He placed it — a flat plane of solidified cursed energy spanning the width of the corridor at the spirit's midpoint, not an attack but a boundary, something that fixed the spirit's spatial layering to a single depth.
The effect lasted four seconds.
Four seconds was enough.
Megumi's shikigami hit clean. Nobara's nail found the fixed point and drove through. Yuji, redirecting off the ceiling with an expression of focused concentration, landed the finishing impact at the correct depth on the first attempt.
The spirit dissolved.
The corridor was quiet.
Yuji landed, rolled his shoulder, and looked back at the blue plane of pigment still hanging in the air at corridor's end. It was already fading, edges softening, losing coherence without Kaito actively maintaining it.
"That was you," Yuji said.
"The geometry was readable," Kaito said.
Megumi turned. He looked at the dissipating pigment plane. Then at Kaito. His expression didn't change, but something behind it recalibrated — the specific adjustment of someone updating an assessment they'd made too quickly.
He didn't say anything.
That was fine.
Ijichi arrived at the stairwell entry with the expression of a man who had just communicated to a response team that their services were no longer required and was now processing several conflicting administrative feelings about that outcome.
"The spirit escalated," Kaito said, preemptively.
"I noticed," Ijichi said.
"The briefing sheet said Grade Three."
"The briefing sheet was based on the initial assessment." A pause. "Which was apparently incomplete."
Nobara looked at the spot where the spirit had been. "So we just handled a Grade Two."
"You handled a contained escalation with unexpected field support," Ijichi said, in the tone of someone technically not confirming anything.
Nobara stared at him. "That's a yes."
Kaito looked at his hand. The pigment residue was still there, faint blue tracing the lines of his palm, and his cursed energy sat quiet in his chest for the first time since the assessment panel. Not suppressed. Not building toward something uncontrolled.
Just still.
He didn't know what to make of that. He'd spent so long managing his technique as a liability that he hadn't left room for the possibility that it might occasionally function as something else.
He filed that thought somewhere he could look at it later.
On the walk back to the stairwell, Yuji fell into step beside him. He didn't say anything for a moment, which was notable enough that Kaito tracked it.
"You saw something the rest of us didn't," Yuji said. Not a question.
"The layering. The spirit was occupying stacked spatial positions. You needed a fixed point before impact."
Yuji nodded slowly. "You knew that immediately."
"Yes."
Another pause. "That's not nothing."
Kaito had no response to that. He walked in silence while Yuji's words settled somewhere he hadn't expected them to land.
Outside, the afternoon had gone gray and close, the sky pressing down over the school grounds with the specific weight of weather that hadn't committed yet. Kaito stopped at the building's edge and looked back at the second-floor window.
The response team's van was already pulling away — unnecessary, departed, the problem already solved by four Grade Four students who technically hadn't been cleared to solve it.
His cursed energy stirred once, low and quiet, and traced something against the inside of his wrist.
An outline. Architectural. The same shape it had made on the wall while he slept.
He pressed his thumb across it and it dissolved.
Not yet.