The fourth day after Minato left.
This day was originally scheduled for Anbu training, but Mokgetsu requested a day off from Sarutobi Hiruzen to teach Kushina the Rasengan.
During the initial planning for the Anbu training, Mokgetsu had left himself quite a bit of leeway, so taking a few days off wouldn't affect his teaching progress.
Before the official training began, Mokgetsu first inquired about Kushina's current training progress.
"That's about it." Kushina stretched out her right hand, gathering a large amount of Chakra in her palm.
Along with the increasing Chakra in Kushina's hand, a Chakra Ball composed purely of Chakra gradually formed in her palm.
"It's not very powerful yet." Kushina slammed the Rasengan into the nearby tree.
Boom!
The moment the Chakra Ball made contact with the tree, wood chips flew, and a shallow spherical hole appeared on the tree.
"It's already not bad. Back in the day, Minato and I took months to get to this point." Mokgetsu nodded in approval.
Now that Minato just completed the development of the Rasengan under his guidance, he had not yet sorted and refined the Rasengan's training process. Kushina reaching this level in such a short time is already commendable.
"Hehe, of course, I am a genius!" Kushina accepted Mokgetsu's praise comfortably.
Of course, although she claimed to be strong, Kushina didn't let Mokgetsu's praise go to her head.
As a ninja, especially a powerful one, Kushina understood that practicing Ninjutsu and developing Ninjutsu were two different matters.
"Next, you need to enhance the Chakra output for the Rasengan, then compress the Chakra to increase the Rasengan's power." Mokgetsu began the formal instruction.
Mokgetsu extended his palm as he spoke, quickly expanding a Chakra Ball on his palm until it surpassed the size of two heads.
But when Mokgetsu began to compress the Chakra, the Chakra Ball swiftly shrank to the size of a fist.
Under Mokgetsu's guidance, Kushina quickly became proficient in forming the Chakra Ball, and the Rasengan's power increased significantly, leaving many holes in the training ground.
"It really takes a professional for this. If Minato had your teaching skills, Mokgetsu, I would have already mastered it." Kushina was quite satisfied with today's results.
The Rasengan, developed specifically for her by Minato, had a high compatibility with her.
Using the fully completed version of the Rasengan was quite Chakra-consuming, which wasn't a problem for Kushina, who was abundant in Chakra.
In a battle, as long as Kushina desired, continuously forming Rasengan wouldn't be an issue due to her abundant Chakra.
This was because not only did she have a lot of Chakra, but she was also the Nine-tailed Jinchuriki, essentially having a supreme energy source within her.
"Minato's teachings aren't bad actually."
Remembering Minato's help in successfully mastering the Flying Thunder God, Mokgetsu said a word on Minato's behalf.
"So-so, definitely not as good as me. I've taught him so many Fuinjutsu, but he hasn't taught me the Flying Thunder God Jutsu." Kushina commented.
Mokgetsu laughed without responding, as this was just a typical, subconscious complaint between lovers, requiring no participation or rebuttal.
[Lesson Completed]
[Evaluation: S]
[Reward: Rasengan +15, slight increase in Chakra Form Transformation Ability, slight increase in Chakra Control Ability]
At the end, a system notification suddenly popped up with a class reward.
"It seems the Nine-tails can trigger the reward." Mokgetsu thought as he looked at the sudden information.
Before today, the minimum number of people needed to trigger class rewards for Mokgetsu was two, the first time with Kushina and Minato, then with Uzumaki Naruto and Yamato.
At that time, Mokgetsu speculated that perhaps Minato and Yamato were just fillers, and the real trigger for the class rewards was Kushina and Uzumaki Naruto, or rather, the Nine-tails within them.
Mokgetsu came to teach Kushina today with a test in mind, and the result was exactly as he had thought.
This made Mokgetsu feel a hint of regret, thinking that if he were of the same era as Orochimaru, he might have had the chance to become Kushina's teacher, but now they could only be friends.
Having a disciple who can trigger class rewards is really great; normally teaching a disciple can trigger class rewards every day.
"Chakra is just one major factor; there are other calculation intervals." Before teaching, Mokgetsu also wondered if Kushina alone could directly trigger an intermediate class reward.
Since Uzumaki Naruto had only half of the Nine-tails within him, and Kushina had the complete Nine-tails, there was a significant Chakra difference.
"If I were to teach a class to all nine Tailed Beasts, it should result in the highest level of class rewards," Mokgetsu thought of a straightforward and forceful way to reach the highest limit.
With nine Tailed Beasts, there would be a combination of great Chakra strength and sufficient amount.
But the condition is too difficult to achieve; even in peacetime, the Great Ninja Villages greatly valued their Jinchuriki and would never send all of them to Konoha to be Mokgetsu's students.
After teaching Yamato in the evening, Mokgetsu practiced Wood Release himself for a while.
"Wood Release: Wood Clone!"
Mokgetsu formed hand seals, and two figures identical to Mokgetsu swiftly appeared.
Although it's a Clone Ninjutsu, the Wood Clone is stronger than the ordinary Shadow Clone.
Wood Clones are harder to distinguish from the real thing, and when they disappear, they can transform into tree branches to entangle the enemy.
...
Shimura Danzo originally planned for Yamato to practice for a month before being assessed.
However, during the fourth week, after completing his official duties, Shimura Danzo suddenly had a whim, feeling that the timing was just right. So he brought two Root Ninjas to Yamato's place.