Minato Namikaze's words made Yuki Yuichi pause, but then he seemed to think of something and scratched his head.
"What kind of ninjutsu are you developing, brother-in-law?"
Hearing Yuki Yuichi call him brother-in-law, Minato Namikaze froze for a moment before coming back to himself and answering with a smile, "It's nothing much."
"I'm just developing a hand-signless ninjutsu."
As he spoke, Minato Namikaze explained his idea.
He had not actually expected Yuki Yuichi to have any suggestions. He was simply feeling frustrated, and talking about it would make him feel better.
The ninjutsu he was working on was actually modeled after the Tailed Beast Ball used by Tailed Beasts.
He already knew that a Tailed Beast was sealed inside Uzumaki Kushina, and he wanted to develop such a ninjutsu to protect her.
After hearing Minato Namikaze out, Yuki Yuichi nodded. So this was the Rasengan.
Yuki Yuichi did know the general principle behind the Rasengan, though he had forgotten the finer details. "Since you're gathering a ball in your hand, why not try making the chakra rotate in opposite directions?"
As he remembered it, the Rasengan seemed to be formed by layers of chakra rotating alternately around one another.
"Yuichi, why did you come up with that idea?" Minato Namikaze looked at Yuki Yuichi curiously.
He had not held out much hope, but Yuki Yuichi's words had just given him some inspiration.
"Reverse rotation...?"
Minato Namikaze murmured softly. He raised a hand and condensed a ball of chakra in his palm, though it was not a Rasengan.
All the chakra within the ball in his palm rotated in the same direction. Staring at it, Minato Namikaze began experimenting according to Yuki Yuichi's idea.
Seeing the chakra ball in his hand, Yuki Yuichi could not help but sigh inwardly.
This ninjutsu