Jinya's training space wasn't a hall.
It was a quiet library, the walls lined with tall wooden shelves. In the center sat a low table with two cushions.
Jinya was already seated, hands resting on his knees. He did not stand when Megumi came in.
"Sit," Jinya said.
Megumi took the cushion across from him.
"Jin'ichi spent two days working on your body," Jinya said. "Stance, joint leverage, striking lines. Today we deal with your quirk. Tell me everything you have. Every summon. Every condition. How long you can keep one out before the strain hits your head. Don't leave out the basic things just because you think they're obvious."
Megumi kept his hands on his thighs and went through the list.
The twin dogs, Kuro and Shiro, and Totality after the white hound was killed. Nue, its carry limit, and the electrical discharge. Toad, the reach of its tongue, and how much weight it could pull. Great Serpent, and the heavy cost of bringing out something that large. Max Elephant, the weight, the water pressure, and how slow it was to form. Rabbit Escape, the swarming numbers, and how easily they broke. Then the storage in his own shadow, sinking into the ground, and the dull headache that started behind his eyes when he pushed too long in a fight.
Jinya listened without speaking once. Occasionally his eyes narrowed slightly, filing a detail away, but otherwise his face stayed still.
"Go back to the tournament," Jinya said when Megumi finished. "The toad with wings against the Tokoyami boy. The water you pulled against Bakugo without calling the elephant. Don't tell me what it looked like from the seats. Tell me what you were doing in your head."
Megumi thought back to the ring. "With Tokoyami, I stopped thinking about Toad and Nue as two different things. I just needed the tongue and the wings at the same time, so I reached for both."
"And the water?"
"Summoning the whole elephant takes too long. Bakugo would have blown it apart before its feet touched the ground. I only needed the water, so I opened the shadow just enough to let it out."
"Do you know why either of those worked?"
Megumi stayed quiet for a second, which was answer enough.
"They are one thing," Jinya said. "One substance, poured into shapes you were handed as a child. Your shadow isn't a box full of pets, Megumi. It's fluid darkness given form by your intent. The shikigami are just habits that you've developed. Nothing more."
Megumi frowned. "So I've been doing it wrong."
"No. You've been doing it without knowing why it works, which isn't the same thing." Jinya stood up, his robes settling around him. "You know how to call the shapes. You don't know what they are made of. That is what we are doing today. Stand up."
...
They moved to an open stretch of floor between the shelves.
"Forget the summons," Jinya said, stopping five paces away and turning to face him. "No dogs. No birds. No names. Take whatever is resting under your feet and cover this floor with it. The boards, the base of the shelves, the corners, me. Cover every foot of it, and don't hold back."
Megumi took a slow breath. He settled his weight into his heels, reached for the cold weight beneath him, and pushed it out.
The shadow under his boots opened.
It spread across the floor in a sudden, quiet wave, climbing the base of the shelves, filling the corners, and pooling across the tops of Jinya's sandals within seconds.
Jinya looked down at his feet, then back up at Megumi. His eyebrows lifted slightly.
"That was faster than I expected."
"Was it supposed to take longer?"
"Hold it," Jinya said, ignoring the question. "Don't move it. Just keep it flat."
Megumi held it. The shadow sat heavy and cold under his command, stretched tight across the room. Five seconds passed. Ten.
Then Jinya moved.
He didn't strike or summon a technique of his own. He simply shifted his left heel back an inch, a quiet adjustment of his stance to test the tension under his sole.
The entire shape came apart.
The instant Jinya's sandal scraped against the dark surface, a tear ran through the spread. The shadow pulled off the shelves, ripped away from the corners, and snapped straight back into Megumi's boots in a single recoil.
Megumi stumbled back half a step, a sharp ache thumping behind his forehead. The floor was bare again.
"There it is," Jinya said quietly. "You built something thirty feet wide. One inch of it met resistance, and the entire structure collapsed. Not just the part under my shoe. Every corner of the room, all at once."
Megumi rubbed a thumb against his temple, catching his breath. "You barely stepped back."
"Shadow has no natural shape. It doesn't want to hold a flat floor you've never practiced before. When you summon the dog, the construct holds because you've called it a thousand times, until the shape holds itself together. But this is new to you so you are holding every inch of it with active effort, second by second."
Jinya stopped and looked at him.
"Because you have no practice with it, your head treats the whole surface as one single piece. When my foot moves, you don't know how to isolate the damage. You don't know how to let the left side tear while keeping the right side standing. So the whole thing panics, and you lose everything. You don't know how to cut off a finger to save the hand."
...
For the next hour, Jinya gave him no rest.
Megumi pushed the shadow out again and again. Jinya disrupted it in small, deliberate increments. First a tap of his toe, then a quick shift of weight, then a short spike of his own quirk driven straight into the floorboards.
Every disturbance traveled through the shadows breaking Megumi's focus and snapping the shadow back to his heels.
"You don't stop a leak in a roof by rebuilding the entire house. Sever the piece that took the hit and keep the rest alive."
By the twentieth attempt, Megumi's uniform shirt was soaked with sweat. He forced his breathing to slow, split his awareness into separate quadrants across the floorboards, and spread his shadow again
Jinya stepped down hard with his heel.
This time, the shadow under Jinya's sandal tore open to bare wood, but Megumi clamped down on the surrounding perimeter. The shadow along the shelves held. The outer ring stayed black for two full seconds before the strain caught up and the rest dissolved.
Jinya looked down at the floorboards, then up at Megumi.
"Better," Jinya said. "You felt the tear without letting it kill the whole surface. Now we stop pretending the world is flat."
Megumi wiped his forehead with his sleeve. "What does that mean?"
"A room has six sides," Jinya said, walking to the center. "A corridor has walls. An alley has brick on both flanks. If an enemy jumps, your shadow on the floor is useless. If they climb, you have nothing. Cover the room. Floor, walls, shelves, ceiling. All of it."
Megumi looked up at the high wooden beams. "The whole volume?"
"The surfaces," Jinya corrected. "Do not try to fill the air. Cling to the boundary. Extend it."
Megumi took a breath and pushed the shadow out once more.
The floor blackened quickly, but when Megumi tried to force the shadow up the vertical wood of the shelves, the dark stalled. It climbed two feet up the lower ledges, thinned into ragged points, and peeled away, falling back down like wet cloth.
"You're pushing it like water," Jinya said, his hands clasped behind his back. "Water flows down. Shadow doesn't have mass until you give it mass, and it doesn't care about gravity unless your head assumes it should. Stop pushing an edge. Spread the skin."
Megumi exhaled and adjusted his focus. He stopped imagining a rising flood. Instead, he gripped the darkness resting at the baseboards and pulled it along the grain of the wood, anchoring it to the surface.
The shadow climbed.
It slid over the lower shelves, blanketed the leather bindings of the books without disturbing them, and climbed the plaster. It hit the top edges of the walls, turned the sharp right angles at the rafters, and crawled across the ceiling planks.
The room darkened rapidly. The amber daylight from the high windows was swallowed as the black sheet sealed over the glass, turning the library into a dim, soundless chamber.
Holding the ceiling felt completely different from holding the floor. The strain pulled hard at the back of Megumi's neck, a sharp, heavy ache that felt like balancing an iron plate on the crown of his skull. A seam over the far corner tore open, letting a streak of bare ceiling show through.
"Patch it," Jinya commanded.
Megumi dragged the dark across the gap. The instant he sealed the ceiling, the floor near Jinya's left side began to fray.
"Don't trade one surface for another," Jinya said. "Keep the loop closed."
Megumi gritted his teeth, locking his hands into loose fists. He drove his quirk into every perimeter at once. The floor blackened completely. The walls went rigid. The ceiling sealed tight. The darkness climbed Jinya's ankles, pooled over his knees, and wrapped around his torso like heavy cloth.
For three seconds, the entire room was encased in unbroken black.
Then Jinya tested him.
He didn't tap lightly. He took a long, forceful stride forward, driving his left shoulder through the shadow shroud while stomping his lead foot into the floor. At the same time, he sent a hard pulse of his own shadow into the wall beside him.
Three separate disruptions hit Megumi at once.
The shadow across Jinya's chest ripped open. The floor beneath his boot splintered into gray vapor. The wall beside the shelves shuddered.
Megumi felt the overwhelming panic surge through his quirk, his instincts screaming to drop the technique and pull everything back to protect his head.
'Cut them,' he thought. 'Sever the breaks.'
He let the shadow around Jinya's left shoulder dissolve. He abandoned the patch of floor under Jinya's lead boot. He dropped the section of wall that had taken the pulse, letting bare plaster show.
He threw every ounce of his remaining focus into the ceiling, the shelving, and the shadow coiled tight around Jinya's trailing right ankle.
Jinya's right foot dragged. The darkness around the leather sandal held fast, locking the joint flat against the floorboards.
One second.
Jinya leaned into his stride, pulling against the bind with his full weight.
Two seconds.
The pressure spiked behind Megumi's eyes, hot and sharp, blood pulsing violently in his ears. Flakes of black peeled from the ceiling planks and vanished into the air, but the main sheet held.
Three seconds.
Jinya turned his hip with sudden, explosive force, tearing his right leg free through sheer physical power.
The room came apart.
The ceiling dropped and dissolved into thin air. The dark on the walls vanished. The floor shadow rushed back into Megumi's boots in a violent, whistling recoil that knocked him back a full step.
His back hit the lowest shelf, rattled books shifting above him, and he dropped his hands onto his knees, coughing hard.
Light flooded back into the library.
Megumi stayed bent over, his chest heaving, his vision swimming with gray spots. A thin trickle of sweat dripped off the tip of his nose.
Jinya stood four paces away, looking down at his right sandal. A faint wisp of dark vapor was still rising from the leather.
"Three seconds," Jinya said.
Megumi wiped his mouth with the back of his hand, fighting for breath. "You broke it the moment you turned your hip."
"Of course I did. I am physically stronger than a flat sheet of shadow held by a child." Jinya looked up, his expression calm and steady. "The point is not that you couldn't pin me forever. The point is that you lost the shoulder, lost the floor, lost the wall, and still kept the ceiling and my ankle pinned for three seconds before your focus failed. This morning you couldn't survive a twitch of my heel."
Megumi straightened up slowly. His spine felt stiff, his neck burning with tension. "It's still too fragile."
"It is enough to make an opponent look at their feet while your dog takes their throat," Jinya said flatly. "You do not need a cage to hold them forever. You need it to hold long enough to kill."
Jinya walked over to the low table and picked up a towel.
"That is the foundation of external control," Jinya said, turning back toward him. "Go wash up and eat."
Megumi gave a stiff bow, picked his uniform jacket up from the corner, and walked out into the corridor.
The evening sky over the compound was dark and clear. His head pounded with a dull, steady ache, but as Megumi looked down at the dark silhouette following his boots across the stone, the shadow felt different.
It was no longer just a well he drew beasts from. It was a territory he could lay over the world, even if only for three seconds at a time.
...
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