Rasengan

After Momokusa Harukawa agreed, Ruri smiled and said to her, "Come on. The first step, or rather, the first stage, is to gather chakra in your palm!"

Hearing Ruri's instructions, Momokusa Harukawa eagerly began trying to gather chakra in her palm.

Momokusa Harukawa held her hand flat in front of her, carefully sensing the flow of chakra before finally directing it all into her palm.

Watching Momokusa Harukawa practice so diligently, Ruri smiled with satisfaction.

Within a few minutes, Momokusa Harukawa could already gather chakra in the center of her palm.

"Ruri, I can gather chakra in the center of my palm now! What do I do next?" Momokusa Harukawa ran up to him and asked with a smile.

Holy crap, seriously? She can already gather chakra in her palm after so little time? What incredible talent and learning ability! Ruri marveled inwardly.

"Ahem. Since you've learned how to concentrate chakra in your palm, it's time to practice the second stage!"

With that, Ruri took the balloons he had prepared out of his pocket and said to Momokusa Harukawa, "The second stage is actually like the first, except we'll be adding a prop!"

Momokusa Harukawa looked at the balloons Ruri had taken from his pocket, pointed at one, and asked, "Is it this balloon?"

Ruri nodded and said, "Yes, this balloon! I'll fill it with water in a moment. Then you put it in the center of your palm and keep releasing chakra from your palm. The flow has to be steady and continuous. Make the chakra move randomly inside the balloon, which will make the water move randomly along with it, and keep going until the balloon bursts!"

With that, Ruri walked over to the Small River and filled the balloons with water.

"All right, hold out your palm. I'll put the balloon on it, and then you keep feeding chakra into it!" Ruri told Momokusa Harukawa, holding a water-filled balloon.

After Ruri placed the balloon on her palm, Momokusa Harukawa began channeling chakra into it.

After several dozen seconds, numerous irregular bulges appeared on the balloon's surface, constantly shifting direction as they pushed outward.

Minato Namikaze, you took inspiration from the Tailed Beast Bomb to create this ninjutsu and spent three years developing the Rasengan! Now a little girl has already grasped the basics in less than an hour! Ruri thought as he watched the balloon in Momokusa Harukawa's hand.

While Ruri was still lost in thought, a pop! rang out, and the balloon in Momokusa Harukawa's hand burst.

Seeing the burst balloon in Momokusa Harukawa's hand, Ruri said with an astonished expression, "Harukawa, I really admire your talent. You've already grasped the basics of the Rasengan in such a short time!"

"Ruri, stop praising me!" Momokusa Harukawa said shyly, her face turning red.

"All right. Since you can now burst the balloon by moving your chakra randomly, your next task is to burst a water-filled balloon in less time. That will better prepare you for practicing the next stage!" Ruri said, looking at Momokusa Harukawa.

Momokusa Harukawa nodded, picked up another water-filled balloon, placed it in the center of her palm, and began channeling chakra into it once again.