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Since it was an important week for them, they decided to learn as much as they could. Both of them agreed to postpone their holiday for this week.
After constant practice of the Shadow Clone Jutsu, they were able to reduce the jutsu's cost to a maximum of 9 units of energy, though Kaida can sometimes manage it with 8 units of energy—although these occurrences were rare.
Leaving that aside, the major change due to their training was a sudden increase in their chakra reserves. They couldn't measure theirs as accurately as Hiruzen, but they could feel that they had somehow doubled their chakra reserves in one week.
Whether it was due to increasing their spiritual energy like Hiruzen said, or always emptying their chakra reserves and filling them back to back using Shadow Clones, or the combination of both.
Because of this, their learning speed doubled. Yomi was now able to make three Shadow Clones, and Kaida was able to make six Shadow Clones, with a feeling that very soon he would be able to create a seventh clone.
On Sunday, 11 brains were working on increasing their knowledge as much as possible. At night, they played shogi with four matches at the same time. They had reached the beginner level in shogi, having played close to 100 matches against each other in the last week. Kaida was playing to increase his tactical thinking and ability to think several moves ahead.
On the other hand, Yomi was just playing because she got to spend time with Kaida. She didn't have much interest in tactics, but since the growth was apparent with this method, she decided to stick with it till the end—at least she got some alone time with Kaida.
Since they didn't know the exact time they had to report to the Hokage, as he had only said to come to his office on Monday, they decided to go to his office at 6 AM to inquire further.
(On Monday…)
Kaida and Yomi woke up and got ready. Ever since they had learned the Shadow Clone Jutsu, their house had been very clean and organized. One of Kaida's clones cleaned the room while the other made breakfast for them.
Yomi was really happy that they got to learn this awesome jutsu. Now they could eat breakfast made by Kaida without him wasting time. Breakfast was the only meal of the day in which they didn't eat a nutrient bar and instead had an actual meal for the last week.
After eating breakfast, they went toward the Hokage's office. Upon reaching the office, Kaida went to the receptionist and said:
"Good morning, miss. Lord Hokage asked us to come to his office on Monday, though he hasn't provided a specific meeting time. Could you please inquire about the timing when we should come?"
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"Of course, little gentleman. Both of you can sit there; I will ask Lord Hokage about this."
She said this while ruffling Kaida's hair. Yomi made a pout when she saw this but kept her mouth shut.
They both sat on the sofa, and after 10 minutes, the receptionist came to them and said:
"Lord Hokage is free now and is asking both of you to go to his office."
In reality, he was going to do some work, but when he heard that both of them were here, he remembered that he had indeed forgotten to tell them the time. So, he postponed his work a little to meet them.
"Lord Hokage," both Kaida and Yomi greeted Hiruzen while bowing.
"So, how is your training going? Have you made any progress with the Shadow Clone Jutsu?"
"Yes, Lord Hokage. We were able to reduce the cost of the Shadow Clone Jutsu to some extent."
"Oh, very well. Make a Shadow Clone with the least amount of chakra you can."
Both of them nodded to each other and performed the hand sign for the Shadow Clone Jutsu.
*Poof*
Two clones were formed near them, but Hiruzen was dumbfounded that they were able to reduce the cost this much in just one week, which would take most ninjas months of practice. And that wasn't even the most shocking part—they had somehow doubled their chakra reserves. He asked both of them:
"Tell me exactly what you guys were doing for the whole week."
They could tell by Hiruzen's tone that he was serious for some reason.
So they told him about their full schedule, and as he listened, understanding dawned on Hiruzen's face.
They had not used one week as just one week; in reality, due to using Shadow Clones, they were able to learn what a ninja would learn in 2-3 months.
They somehow trained for 18 hours daily for the last week and used 4-8 Shadow Clones for learning. They had just somehow managed to do the work of 3 months in 1 week.
He remembered the teachings of Hashirama Senju: "Talent is just working harder than working hard," and these two ninjas in front of him were proof of this.
He smiled and said:
"Very good, both of you. If you continue to work this hard, I am sure both of your parents will be very proud of you in heaven.
Now, the most important thing for which I called you is this."
He took out two chakra papers and put them on the table. Seeing this, Yomi suddenly said:
"Lord Hokage, we have already checked our chakra nature. Mine is lightning, and Kaida's is fire. You don't have to waste that chakra paper," and then as a whisper, "It is costly."
"Hahaha, no problem, my child. This much is nothing for you guys. As for your chakra nature, it is wonderful news that you have a lightning attribute. It is very rare and hard to tame, but this attribute can make you strong if mastered properly. As for Kaida, there is no element as destructive as fire, so you too can become strong.
But this chakra paper is special—you will see once you pass your chakra through it."
Both of them nodded and passed their chakra through the papers.
Kaida's paper was divided into three different parts: the largest one burned, the medium-sized one got bisected into two, and the last one turned into dust.
As for Yomi, her chakra paper was divided into two parts: the last one crumbled, and the second one became wet.
Hiruzen was very happy with the result. It wasn't every day that you got to see such a combination, especially in such talented children. He said:
"Very good. The details you just got tell us about all of your chakra natures. Since both of you have such a great combination of chakra attributes, I will arrange a teacher for both of you to learn from. As you may know, in the third part of your academy training, you will learn elemental jutsu."