Yahiko's eyes flickered after he heard Qingyun's words.
But he had no other choice now. If he went looking for Nagato and Konan, Black and White Zetsu, lurking in the shadows, would certainly find out. They would then plot against him again, endangering not only him but also Konan. He could not allow her to be hurt because of him.
Since Qingyun had promised to resurrect Nagato once he fulfilled his destiny, Yahiko chose to believe him. After all, Qingyun had no reason to lie to him.
As for what Qingyun might ask him to do later, he had not considered it. For Konan and Nagato, he would do more than merely work for Qingyun. Even if Qingyun wanted his life, he would give it without hesitation.
Having returned from the dead, he had abandoned those ridiculous ideas he once held. To hell with peace. In pursuit of that elusive dream, he had thrown away his life and left Konan and Nagato suffering the pain of losing someone dear to them. Now, all he wanted was to finish Qingyun's task as soon as possible and reunite with them.
"All right. I'll do as you say!"
After thinking it over for a long time, Yahiko gave his resolute answer.
"This is the Northern Darkness Divine Art. What you need to do now is open a dantian inside your body, then convert your chakra into the internal force of the Northern Darkness Divine Art."
As he spoke, Qingyun handed the Northern Darkness Divine Art to Yahiko, then explained the principles of internal arts, the major acupoints throughout the body, the twelve main meridians, and the eight extraordinary meridians.
Much later, once Yahiko had familiarized himself with all this, Qingyun took out a copy of Basic Swordsmanship. He told Yahiko to practice it