Meiji 40 (1907) — Late Autumn
The river had not changed.
Its water still whispered over stones smoothed by centuries, catching the late-autumn light and breaking it into trembling shards of gold. Maple leaves drifted past like small, burning boats, carried away without resistance.
Kai walked ahead of them.
Not far—just enough that the space felt wrong.
Mitsuri noticed first.
She always did.
His steps were measured, too careful, like someone afraid of leaving footprints. His shoulders were straight, but there was tension there—coiled tight, pulled inward. He hadn't spoken since they left the village.
Kanae exchanged a glance with Shinobu.
Shinobu's smile was still there, light and polite, but her eyes had sharpened.
Something was coming.
"Kai?" Mitsuri said softly, quickening her pace until she walked beside him. "You've been quiet all morning."
He stopped.
The river filled the silence for him.
They sat together on a smooth stone near the bank, the cold seeping through fabric. Mitsuri folded her legs beneath her, Kanae sat with her hands folded neatly in her lap, and Shinobu leaned back on her palms, gaze drifting to the water—but never fully away from him.
Kai stared at his reflection.
It wavered with every ripple.
"I need to tell you something," he said.
His voice was steady.
That frightened them more than if it hadn't been.
Mitsuri leaned forward instinctively. "You don't have to—"
"I do."
He turned to them then, and for a moment, none of them spoke.
A year had passed.
A year of relentless training, of nights soaked in sweat and blood, of breath refined to its edge. Shinobu's movements had grown sharp enough to cut the air itself. Kanae's presence had become calm and overwhelming, like standing before a quiet storm. Mitsuri's strength—once wild and unchecked—now flowed like a living thing, devastating and beautiful.
And Kai—
Kai stood at the peak.
His body moved with a stillness that felt wrong, like the world itself was waiting for him to act. His senses stretched farther than sight or sound. Sometimes, when he focused, it felt as though the world peeled open before him, showing something deeper beneath.
Something close to—
He clenched his fists.
"There are demons in this world," he said.
The river did not react.
The girls did not interrupt.
"They hunt humans. They hide among us. And for centuries, there have been people who fight them." His jaw tightened. "The Demon Slayer Corps."
Mitsuri's breath caught.
Kanae's eyes widened—not in fear, but in recognition.
Shinobu's fingers curled slowly against the stone.
"I've known for a long time," Kai continued. "Longer than I should have. And I've been training—not just to protect us." He met their eyes, one by one. "But to kill them."
Silence.
Then Mitsuri whispered, "Kai… what aren't you telling us?"
He exhaled.
"My face. My body. My strength." His hand rose, hovering near his own features. "I resemble someone."
Kanae's heartbeat thundered in her ears.
"A man from legend," Kai said quietly. "A swordsman so powerful that even demons feared his shadow. Yoriichi Tsugikuni."
The name settled like ash.
"If the wrong people realize it," Kai went on, "they won't come for me."
Shinobu's eyes narrowed. "They'll come for us."
"Yes."
Mitsuri stood abruptly. "That's ridiculous! If you're strong, then—"
"I can't protect you from everything," Kai said, not raising his voice. "Not yet."
Kanae felt it then—the weight behind his calm.
Resolve.
"I'm going to join the Demon Slayer Corps," Kai said. "Officially. I'll draw attention away from you. I'll fight. I'll become something they look at instead of what's beside me."
Shinobu laughed once—sharp, brittle. "You think we'd let you go alone?"
Mitsuri's eyes burned. "You're not leaving us."
Kanae stood.
Her voice was gentle, but it carried the authority of someone who had already decided. "If you walk into danger," she said, "then we walk with you."
Kai opened his mouth—
"No," Kanae said softly. "This isn't a discussion."
Shinobu smiled, this time real and dangerous. "Besides," she added, "we've already super strong. Did you really think we wouldn't notice what we were preparing for?"
Mitsuri grabbed his sleeve, squeezing hard. "We're not fragile."
Kai closed his eyes.
For the first time in a long while—
He felt afraid.
---
The oni mask rested in his hands.
It was simple. Pale wood, rough-carved horns, hollow black eyes.
A barrier.
A lie.
He tied the cord behind his head and lifted his gaze.
The reflection staring back was no longer unmistakable.
Good.
"This will help," he said quietly.
Mitsuri touched the edge of the mask, her fingers lingering. "I don't like hiding you."
"I don't like endangering you."
Kanae turned as footsteps approached.
The families listened carefully as Kai spoke—of traveling, of training. He don't spoke of danger, demons.
They saw the seriousness in his bow.
They consented.
Trust was given.
Secrets were kept.
---
Mount Sagiri rose through the mist like a memory.
Cold.
Silent.
The air itself felt sharpened.
Urokodaki Sakonji waited.
The former Water Hashira stood with his tengu mask unmoving, arms folded within his robes. His presence was heavy—not overwhelming, but absolute.
"You wish to join the Final Selection," he said.
"Yes," Kai answered.
"So do we," Kanae added.
Urokodaki turned. "Then prove you are not walking corpses."
The duel was brutal.
Kai moved like flowing water sharpened into steel, every strike precise, controlled. Mitsuri's blade bent and snapped with terrifying force. Kanae's calm pressure tested openings Shinobu exploited with surgical precision.
Urokodaki did not go easy.
He did not need to.
When it ended, frost clung to the ground beneath them.
Silence followed.
Urokodaki exhaled slowly.
"…Very well," he said. "I will tell you where the Final Selection is held."
Mount Fujikasane.
A place of wisteria and death.
As they descended the mountain, the path ahead felt clear.
Dangerous.
Unavoidable.
Kai touched the oni mask at his side.
I will walk forward.
Even if the world remembers my face.
---