Winter on the mountain wasn't a season. It was a siege.
The snow piled up against the walls of the hut until the windows were just opaque squares of blue-grey light. The world outside had vanished. There was only the heat of the hearth, the smell of miso, and the constant, rhythmic sound of work.
My ribs had finally stopped clicking. The bone had knitted into a solid, slightly crooked ridge that I could feel through my skin. It was a permanent record of the ravine. A reminder of failure.
I didn't let it slow me down.
"Lower," I commanded.
Tanjiro was in the center of the room, holding a heavy water bucket in each hand. His arms were shaking. His face was bright red, sweat dripping from his chin despite the draft crawling across the floorboards.
"My legs... they're burning," he wheezed.
"That's the point," I said, sitting on a low stool with Kū-on across my lap. I wasn't drawing the blade. I was just cleaning the scabbard with a piece of oiled silk. "If your legs burn, it means you're using muscle. If you use muscle, you exhaust yourself. Find the bone. Let the skeleton carry the weight. Breathe into your hips."
"I'm trying," he gasped.
"Stop trying. Just exist in the stance. If you gasp, you lose the pressure. If you lose the pressure, the buckets get heavier. Inhale. Four seconds. Hold. Four seconds. Exhale. Six seconds."
I watched him. His chest heaved once, a jagged movement that broke his form. One of the buckets tipped, spilling a splash of cold water onto his feet.
"Again," I said.
I wasn't being cruel. I was being practical. On this mountain, a moment of physical weakness was the difference between coming home with charcoal and freezing in a ditch. I had seen him haul those baskets. He was doing it through sheer, raw willpower. Willpower runs out. Technique doesn't.
Kie watched us from the corner while she prepared the evening meal. She didn't interfere. She saw the change in Tanjiro. His posture was straighter. His movements were more deliberate. He wasn't just a boy anymore; he was becoming a pillar.
"Ryo," Nezuko called out from the doorway of the back room.
I looked over. She was holding a bundle of white cloth. My old bandages. She had washed them, bleached them in the snow, and dried them by the fire.
"You don't need these anymore, do you?" she asked.
I looked at my side. The bruising had faded to a sickly yellow-green. "No. The structure is stable."
"Then I'm making you a new undershirt," she said. "The one you came in was mostly holes and blood. You can't train my brother while looking like a beggar."
"I've looked like worse," I grunted.
"Not in this house," she countered.
She sat down near the hearth and began to cut the cloth. She was like her mother—quiet, observant, and possessed of a strange, unshakable strength. She didn't fear the sword on my lap. She treated it like any other tool, like an axe or a needle.
I turned my attention back to Tanjiro. He had stabilized. The shaking in his thighs had lessened. His breathing had slowed into a deep, mechanical hiss.
Hsss-pa. Hsss-pa.
"Good," I said. "Put them down."
He lowered the buckets with agonizing slowness, making sure not to make a sound when they hit the wood. He stood up, rubbing his quads, his chest heaving with exertion.
"It felt... different that time," he panted. "The weight didn't go away, but it felt like it wasn't mine. Like it belonged to the floor."
"Now you're learning," I said. "The earth is stronger than you are, Tanjiro. Use it. Let the weight pass through you into the ground. That is how you carry a load for ten miles without collapsing."
We sat down for dinner. It was a simple meal—daikon radish, a bit of dried fish, and a bowl of millet. It was the food of the poor, but in this room, with the wind howling outside and the children laughing as they fought over the last bit of fish, it felt like a feast.
I watched them. Takeo was trying to mimic my sitting posture. Shigeru was asking Tanjiro about the town. Hanako was leaning against Nezuko's shoulder, half-asleep.
It was a dangerous warmth.
For years, I had moved through the world as a ghost. I didn't leave footprints. I didn't make friends. I didn't owe anyone anything. But now, I was rooted. I knew the specific creak of the third floorboard. I knew the way the smoke curled when the wind shifted North. I knew the exact temperament of each child.
I was getting soft.
No, I told myself. I'm recovering.
But the lie was getting harder to believe. I wasn't just healing my ribs; I was filling a void I hadn't realized was there.
"Ryo," Kie said, her voice cutting through my thoughts. She was looking at me with that unnerving, maternal clarity. "The snow will begin to melt in a few weeks. The passes will open."
The room went quiet. Even the children stopped talking. They all knew what that meant. When the passes opened, travelers moved. And I was a traveler.
"I know," I said.
"You don't have to go," Tanjiro said quickly. "We have plenty of work. We could use the help with the spring harvest, and the charcoal burning is easier when there are two men—"
"I'm not a charcoal burner, Tanjiro," I said, more sharply than I intended.
The boy flinched slightly. I felt a pang of regret, but I pushed it down.
"I have things I need to finish," I continued, my voice softening. "People I need to find. This mountain is a sanctuary, but it isn't the world. The things I'm looking for don't live in the snow."
"But you're not ready," Nezuko said, not looking up from her sewing. "Your lung still hitches when the air gets too cold. And your sword... you haven't even drawn it once since you stood up."
She was right. I hadn't drawn Kū-on. I was afraid to. Not because of the pain, but because I was afraid of what I would see. A notched blade. A rusted edge. A reflection of a man who had almost been erased by a ravine.
"I'll be ready when the time comes," I said.
I stood up and walked to the door. I slid it open just a crack. The freezing air rushed in, smelling of ozone and ancient ice.
I looked out into the dark. The trees were heavy with snow, looking like white-shrouded ghosts. It was peaceful. It was silent.
But I knew better.
Beneath the peace, there was a friction. The world was moving. The things that hunted in the dark were still out there, waiting for the snow to recede so they could find fresh trails.
I looked at the Kamado family. They were a bright, warm light in a very dark place. And lights always attracted moths.
I closed the door and sat back down.
"Tomorrow," I said to Tanjiro. "We start with the axe. Real weight. No more water buckets."
Tanjiro nodded, his eyes determined.
I would teach him everything I could before the spring. I would make him strong enough that he wouldn't need a broken soldier to protect his home.
Because when the snow melted, I would be gone. And the mountain would be hungry again.