"Rasengan, huh." Naruto Uzumaki said in a strange tone.
Naruto naturally knew this signature ninjutsu of his inside and out. In his previous life, Lu Xuan had taught him this technique. From then on, the Rasengan had become both his most proficient and most powerful ninjutsu.
The series of upgrades he later made to this technique had been the same way.
However, after coming to this world, Naruto learned that the Rasengan had been developed by his father, Minato Namikaze. That did not match what he had known in his previous life.
But Uchiha Shin's name had never appeared in this world from the very beginning, so it was hardly surprising that there were such changes.
Of course, Jiraiya had no idea of the complicated thoughts running through Naruto's mind. At that moment, he had fully immersed himself in the role of a great and venerable teacher.
After Naruto came to this world, Minato Namikaze had not taught him a high-level ninjutsu like the Rasengan due to his Hokage duties and because Naruto had been too young before. Although Naruto had used it in his battle with Itachi last time, no one else knew about it. Thus, in Minato and Jiraiya's eyes, Naruto might possess the Nine-Tails' power, but when it came to ninjutsu, he was a blank slate.
"The Rasengan is a ninjutsu created by your father. It gathers chakra and spins it at high speed to achieve maximum destructive power. Though it is only ranked A, it is believed to have further variations. If you can infuse it with an elemental nature, its power will rise to another level.
"But that isn't something you need to consider right now. I'll teach you the most basic Rasengan first."
As Jiraiya explained, he held out his right hand. Chakra gathered