The mountain air hit him the moment he stepped outside.
Zenjiro was already in the middle of the stone courtyard behind the temple, standing with his hands behind his back, face tilted slightly upward the way he did when he was listening to something nobody else could hear.
The courtyard was small and flat. Cedar trees on three sides. The mountain rising behind them. No equipment. No weapons. Nothing except cold stone and cold air and the distant sound of wind moving through the upper branches.
Kairo looked around.
"Where do we start?"
"Stand in the centre of the courtyard."
He walked to the middle and stood there.
"Now close your eyes."
He closed them.
"Tell me what you hear."
Kairo listened. "Wind. Birds somewhere up the mountain. Your breathing."
"What else?"
He pushed further. The creak of the cedar trees. A stream somewhere below the path — he hadn't noticed it on the way up. The distant low hum of the train line they had left behind.
"A stream. Below the east path."
"Good. What else?"
He tried to go further and found nothing.
"That's all I have."
"No," Zenjiro said simply. "That is all you are currently willing to receive. There is a difference." He walked a slow circle around the courtyard edge. "Your Echosense is an extension of perception. But perception is a muscle. Right now yours is reactive — it only opens when something forces it open. The gate latch. The desk. The seal." He stopped walking. "A reactive ability will get you killed. We are going to make it deliberate."
"How?"
"By starting with the body first." He gestured at the ground. "Sit."
Kairo sat cross legged on the cold stone.
"Every morning you will sit here for one hour before we do anything else. No moving. No adjusting. You will sit with whatever the stone gives you and you will not run from it."
"You mean the echoes."
"This stone is six hundred years old," Zenjiro said. "It has held more weight than you can imagine. Sit with it."
Kairo placed his bare hands on the courtyard stone — he had removed the gloves when Zenjiro told him to — and waited.
It came slowly at first. Not the sharp violent rush of the gate latch or the desk. Something older and quieter — like sediment rather than flood. Feet crossing this stone over centuries. Students sitting exactly where he was sitting. Rain. Firelight. The particular grief of someone who had knelt here a very long time ago and pressed their forehead to the ground.
He breathed through it.
It kept coming.
He breathed through that too.
"Don't reach for it," Zenjiro said from somewhere behind him. "Don't push it away. Let it move through you the way water moves through a held hand. You are not a vessel. You are not a wall. You are simply present."
Kairo sat.
The cold came up through the stone into his palms and his knees and somewhere in the first twenty minutes his back started to ache and his legs went partially numb and the echoes kept moving through him in slow quiet waves and he breathed through all of it and said nothing.
When Zenjiro finally said stop he had no idea how much time had passed.
He opened his eyes. The light had shifted. Longer shadows across the courtyard.
"Stand up," Zenjiro said.
He stood. His legs took a moment to remember what they were for.
"How do you feel?"
Kairo considered it honestly. "Quieter."
"Good." Zenjiro moved to the centre of the courtyard. "Now we move."
What followed was not what Kairo expected.
No weapons. No strikes. No technique he could name or recognise from anything he had seen.
Zenjiro moved through a series of slow deliberate postures — weight shifting from foot to foot, arms tracing arcs through the air, the whole thing unhurried and almost meditative. Like watching water find its level.
"Copy what I do. Exactly."
Kairo copied.
He was immediately wrong.
Not in the obvious ways — he could mirror the shapes well enough. But Zenjiro kept stopping him. Your weight is in your heels. Move it forward. Your shoulders are carrying tension you don't need. Drop them. Your eyes are tracking me visually — stop. Feel where I am instead.
"Feel where you are?"
"Close your eyes and move."
"I'll fall."
"Probably."
He closed his eyes and tried to continue the sequence.
He lasted about four seconds before his balance went and he caught himself with one foot.
"Again."
He tried again. Three seconds this time.
"Again."
This continued for a long time. The mountain was patient about it. So was Zenjiro. Kairo was less patient but he kept his mouth shut and kept trying because the alternative was going back to Harue's spare room and staring at the grey wall and he had decided that was finished.
Somewhere around the twentieth attempt something shifted.
He stopped trying to calculate the balance and just — moved. Let his weight find itself. The sequence flowed out of him for almost fifteen seconds before he lost it.
He opened his eyes.
Zenjiro was facing away from him, which meant he couldn't have seen it.
"Better," the old man said.
"You weren't watching."
"I told you. Stop using your eyes as your primary sense." He turned. "You have Echosense. The space around you holds information constantly. People's movements. Where weight was placed. How the air shifted. Your ability is not only backward — it is not only about the past. With training it will read the present moment as it happens."
Kairo stared at him.
"I can read what's happening now?"
"You already did it on the train." Zenjiro sat down on the stone steps of the temple. "You said you noticed the two men when they boarded. That they looked at you once and you knew. That was not intuition. That was Echosense operating at its edge — reading the residual intent in the space around you before your conscious mind processed it." He folded his hands. "We are going to push that edge until it becomes the centre."
Kairo stood in the courtyard and let that settle.
He thought about the train. The cold feeling at the back of his neck. The way he had known before he could explain knowing.
"How long will it take?"
"That depends entirely on you." Zenjiro stood. "Your father took four years to reach full integration. But your father's awakening was gradual. Yours was violent. Grief and trauma accelerate the ability in ways that comfort never does." A pause. "You may be faster. You may also burn out faster if you push without structure. Which is why you will do exactly what I tell you and nothing beyond it. Understood?"
"Understood."
"Good." He moved toward the temple door. "Come inside. We are not finished."
They sat at the low table again.
Zenjiro placed three objects between them — a smooth river stone, a folded piece of old cloth, and a short length of wooden rod worn dark with use.
"Read them," he said. "One at a time. Out loud."
Kairo looked at the objects. "All of them?"
"One at a time."
He picked up the river stone first.
It was gentle — just water and time, the slow patient memory of a streambed. Nothing human in it. He set it down.
"Water," he said. "Old streambed. Nothing else."
"Correct. The cloth."
He lifted the folded cloth carefully. This one was different — immediate and human. A woman's hands, folding it with the mechanical precision of someone performing a task while their mind was somewhere else entirely. Grief nearby but not in her — adjacent to her, like weather she was standing next to.
"A woman folded this. She was grieving something but staying controlled. Someone else's grief, not her own."
Zenjiro's expression didn't change. "That cloth belonged to your mother. She folded it the morning she sent it here with your father three years ago."
Kairo set it down carefully.
"The rod."
He picked up the wooden rod and the room disappeared.
A training courtyard — this courtyard, but decades ago. A younger Zenjiro, eyes still seeing, moving through drills with a student Kairo's age. Patient corrections. The same instructions he had heard today in different words. Then later — the same rod in his father's hands, Setsuna working through sequences alone in the early morning dark, breath fogging in the cold air, the focused quiet of a person who had chosen discipline the way other people chose a religion.
His father. Young. Maybe sixteen. Right here on this stone.
Kairo put the rod down slowly.
"He trained here."
"For six years." Zenjiro's voice was quiet. "From the age of fourteen until he was ready. He sat on that same stone this morning where you sat. He fell trying to move with his eyes closed exactly where you fell." A pause. "He also found it in fifteen seconds on his fortieth attempt. You found it in twenty."
Kairo looked at the rod on the table.
"He was better than me."
"He had more time." Zenjiro stood and collected the objects. "You will have to find a different way to close that gap."
He put the objects away and came back to the table.
"There is one more thing we need to discuss today."
He reached into his robe and placed a small folded paper on the table. Old. Handled many times.
"Your father gave me this two years ago. He said if I ever had to give it to you then everything had already gone wrong. He said to give it to you only after you had decided to train. Not before."
Kairo unfolded it.
His father's handwriting. Three lines.
Kairo.
The evidence your mother encoded is hidden in the clan archive. Only your Echosense can find it. Only you can finish what I started.
I'm sorry I kept you from this world. I was wrong.
He read it twice.
Then he folded it carefully and put it in his jacket pocket next to the note from Aoi.
Two folded pieces of paper. Two people telling him they were there.
He sat quietly for a moment.
Then he looked up at Zenjiro.
"Tomorrow," he said. "Same time?"
The old man almost smiled. It was subtle — a slight shift at the corner of his mouth, there and gone.
"Earlier," he said. "The mountain is better before the birds wake up."