Serou's house. Two weeks later.
The routine had become clear.
Dawn: sit in the courtyard. Silence. Listen.
Morning: read—Serou had more books than Kaito could count, books on seals, chakra, and histories no academy would ever teach.
Noon: questions and answers—Kaito would ask, and sometimes Serou would answer. Sometimes he would respond with a question of his own.
Evening: sit again. But this time, with something added.
"I want you to try something."
Serou said it on the evening of the fourteenth day.
"What?"
"Don't listen to the seal this time." He placed a small stone in front of Kaito. "Listen to the stone."
Kaito looked at him.
"The stone isn't alive."
"Who said it wasn't?"
Twenty minutes later, Kaito said, "I feel nothing."
"That is because you are searching for the same thing you felt from the seal," Serou said. "The stone is different. Quieter. Slower."
"Slower than silence?"
"Silence is active. The stone…" He thought for a moment. "The stone is still. The difference between a calm sea and solid ground."
Kaito tried again.
Five minutes.
Ten.
Then—something. Completely different from the seal. Cold. Heavy. Very old.
He said slowly, "I feel… its weight? But not just its real weight."
"Another kind of weight," Serou said quietly. "Yes."
After a month, Kaito could read simple seals.
After three months, he understood the basic structure of compound seals.
After six months, Serou handed him a page and said, "Read this."
Kaito read it. Then raised his head.
"This is wrong."
"Where?"
"Here." He pointed to the center of the page. "This sub-seal cancels the primary one if it activates first. But it's written as if the two were independent."
Serou looked at him for a long time.
Then he smiled—a smile Kaito had never seen from him before.
"That mistake killed three experienced shinobi fifty years ago."
A full year passed.
Kaito turned six. Then seven.
His body changed—not dramatically, but in a quiet way. Slightly taller. A face that was slowly losing some of its childhood softness.
And the mark on his wrist became clearer whenever he was calm—pulsing steadily, like a clock that never stopped.
On a night in the thirteenth month, Kanai returned.
Suddenly. Without warning. He knocked on the door at midnight.
Serou opened it and looked at him.
"Sato?"
"Alive," Kanai said. "Captured. But alive."
Serou closed his eyes for a second, then opened them again.
"Kaito will ask."
"I know."
Kanai entered.
Kaito was already awake—he had heard the knock. He stood in the doorway of his room.
They looked at one another.
Kanai spoke at once.
"Sato is alive."
Something moved in Kaito's chest. Not full relief—something quieter. Something like breathing again after holding air for too long.
"Captured."
"Yes."
"By whom?"
Kanai paused.
"Root."
Silence.
Then Kaito said, his voice unchanged, but heavier,
"They're using her."
"They're trying to learn what she knows about the seal. About you." He paused. "Sato won't talk. I'm sure of that."
"But they'll keep trying."
"Yes."
Kaito went back into his room.
He sat down on the floor.
The mark pulsed on his wrist.
The first debt.
The words he had said to himself that night on the pale stone outside Kori.
Now they had become something heavier. Sharper.
Sato was in Root's hands.
Because she had chosen to stay.
Because his mother had asked it of her.
And because I was there.
He looked down at his wrist.
Two years, Serou had said.
How much time had passed?
One year and one month.
He counted slowly.
Eleven months.
The next morning, he found Serou in the courtyard drinking something hot.
He sat across from him.
"You said safe access to the memory would take two years."
Serou looked at him.
"Yes."
"What if we try sooner?"
"I told you what would happen."
"I know what you said." He looked directly at him. "But now Sato is captive. And Root wants information about the seal." He paused. "Maybe the memory my mother left behind contains something that can help."
Serou answered slowly.
"Or maybe you will find something you won't know how to survive at your age."
"I'm not an ordinary child."
"I know." Serou looked at him with eyes that neither denied nor agreed. "But you are still a child."
Silence.
Then Serou said,
"Give me a month."
"Why?"
"Because there is an intermediate step I didn't tell you about." He looked at Kaito's wrist. "Not full access to the memory—but listening. The same way you listened to the stone. Only inward. To the seal when it is calm."
"That's different from full access?"
"It's the difference between standing at the door of a room and entering it," Serou said. "The door is less dangerous."
Kaito looked at him.
"A month."
"A month."