Ye Feng and Minato Namikaze discussed it together. The more they experimented and exchanged ideas, the better they understood the Rasengan, until four hours had passed and the sky was already pitch-black.
A blue sphere of chakra finally appeared in Minato Namikaze's hand, though it was a little small. Minato drove the Rasengan into a nearby tree. Wood chips flew, and a deep, spiral-shaped crater appeared in the trunk.
"This power exceeds the damage of a B-rank ninjutsu, and this is only its initial form. Once mastered, it'll be at least an A-rank ninjutsu!" Even Minato Namikaze was stunned by its power. How could creating an A-rank ninjutsu be easy? He had never expected to create a completely new A-rank ninjutsu with Uchiha Yefeng in such a short time, let alone one that needed no hand seals.
"You really are impressive, Ye Feng, coming up with such a powerful ninjutsu that needs no hand seals."
"It was only a theoretical idea. You're the impressive one, Minato, actually creating it from theory alone." Ye Feng blushed slightly, then sent a little flattery his way.
"Your theory was what mattered, Ye Feng. Without a sound theory, we couldn't have successfully learned it. It's already dark. You haven't eaten yet, have you? My treat. Let's go eat!" Minato Namikaze scratched his head too, looking excited as he offered to buy Ye Feng dinner.
At that moment, however, Minato Namikaze had a vague feeling that he seemed to have forgotten something, but he could not remember what.
Ye Feng and Minato Namikaze walked down from Hokage Rock toward Commercial Street, still discussing their insights into the Rasengan along the way.
As they walked, however, Ye Feng felt an overwhelming murderous aura surge toward him and Minato Namikaze. He turned his head and saw a