Kakashi rubbed his left eye for a few minutes, before it stopped itching, and then suddenly felt something. 'Huh! I am sensing another ability of Kamui now, but how?'
Kakashi questioned inwardly and mused, 'And is this the reason why I suddenly felt itching, because my chakra started to drain from Sharingan even more than before. Though not that it's any problem for me.'
He shrugged these thoughts off for now, before looking at his students and said, "Stop looking at me with these looks, I said It's nothing."
Naruto and Sakura stopped looking at Kakashi with worried eyes, and sighed in relief internally. Then Sasuke again asked, "So, Sensei, when are we doing our next mission?"
Kakashi replied, "I actually haven't thought about it, but don't worry, if you are that eager, we can have another C-rank mission within the next week."
Sasuke gave Kakashi a satisfying nod, while Naruto got overjoyed, clearly glad to do a proper mission this time. In the last mission, they didn't get to fight any ninja, but this time, Kakashi has already promised to let them fight any enemy, if they encounter.
Sakura was also happy, since this will give her more time to spend with Team 7 and her Sasuke-kun. Then Ayame came, with her father Teuchi, both carrying four bowls of Ramen, settled them in front of the team. With his usual warm smile, Teuchi said, "Enjoy your Ramen."
________________________________
After having Ramen, all went their separate ways, while Naruto with Kakashi, at his place. Next two days were same as usual for Kakashi, aside from him going to the mission counter and checking current available C-rank missions for Team 7.
In the meantime, he also offered Sasuke, who is now only left alone, to shift in his place, as Sakura lives with her family. Hiruzen had just jokingly said this, but Kakashi really asked Sasuke. However, Sasuke plainly refused, saying he didn't feel the need for it, and Kakashi also didn't force him.
While in these two days, Kakashi also has tried once, the new ability of Kamui, which is now accessible to him, the ability of Self-Teleportation in Kamui Dimension.
Though he immediately went and came out, not wanting to let his presence be known to Obito, who most of the time stays in Kamui Dimension.
He didn't know how he already gained access to this ability, but only could think that his increased Chakra is the reason for this. This also makes him even more sure, that even his left Mangekyō Sharingan has other abilities as the Right Kamui of Obito.
But this also came with a small cost, because gaining access to another ability of Kamui, means his Sharingan's ocular power also increased, results in obviously more drain of chakra, however this no longer is a problem for him.
Currently, it's night time, Kakashi has been in his room, laying on his bed, muttering, "This is only my guess, that my Sharingan's ocular power has increased, but if it's really true, then same should be the case with Right Kamui in Obito's eye. But he always shown to possess all abilities of Kamui, not just Short-range Teleportation alone."
Kakashi thought a bit, and concluded, "Maybe it's because of Hashirama's cells in Obito, which has obviously increased the ocular power of his Sharingan."
He then shrugged and muttered, "Hope with my increase in chakra, my Sharingan's ocular power also increases to the point, that I shouldn't have to worry about it losing its vision and sort out the blindness issue."
"Haaa..." He yawned, feeling sleepy, it's already around 10 PM of night, and he then went to sleep. It only has been a few hours, then suddenly the air in front of Kakashi started to ripple, and a familiar yet unfamiliar voice called out Kakashi.
[Congratulations, Host!]
[For reaching Peak-Kage Level Chakra. System upgradation started...]
Kakashi jolted awake, with wide eyes, as he hasn't covered his left eye while sleeping, he stared at the transparent dark text in front of him, utterly dumbfounded.
"What's going on with the system?!"
Kakashi muttered, after all this is the second time he has heard the system's voice, the first time was when the system activated after his transmigration. He now was completely awake, no longer felt sleepy, his eyes widened in surprise, because the system was speaking once again. In next few minutes...
[System upgradation completed...]
[Daily Chakra Growth has increased from 20,000 to 50,000 per day.]
[Host: Kakashi Hatake]
[Chakra Pool: 1,007,350/1,007,890]
[Chakra Control: 92/100]
[Chakra Level: Peak-Kage]
[Chakra Affinity: All]
[Chakra Growth: +50,000 per day]
Kakashi once again was caught dumbfounded by the system, and muttered, "Upgradation, and that too directly to 50,000 points? Now how faster would my chakra grow.. no, I have other things to ask system."
With this thought, he asked, "System, why have you never spoken, whenever I tried to call you before and why now suddenly. Only for this upgrade or something?"
Kakashi has indeed tried to call out the system for the next few days after it activated first, but it never replied, so he thought it's just a one-time thing only, and never bother after few days of tries.
[System has only obliged to converse with Host, at Three particular moments. One during successful activation, next during System upgradation and last during Final upgradation.]
Kakashi was surprised and asked, "Is that so, and there is going to be another upgradation as well?"
[Affirmation.]
"Then why haven't you told me about these things before?" Kakashi asked.
[You never asked. Unless Host have no queries, I can't say anything extra.]
"..." Kakashi's eyes twitched slightly, he feels that the system should have told him this much anyways.
He then raised a brow and asked curiously, "Then tell me who created this system and gave it to me, and does that entity is also the reason of transmigration here?"
[Negative!]
"???" Kakashi was surprised, and muttered, "Even the system has no answer to this, but whatever, it's not like I am any curious to finding this out."
[Does Host have any other queries?]
Kakashi thought a bit and remembered his speculations about Chakra and asked, "Does the system have any other abilities aside from increasing my chakra, like passively? And please, explain this to me properly in details..."
[System only has one task, to increase Host's Chakra without limit. However there are a few passive gains Host can gain, which includes an increase of Yang Release and Yin Release Chakra in his overall Chakra.]
[As Chakra is more than just a form of empty energy. It is created by combining two energies, Physical and Spiritual energy which every ninjas possess. However, no normal ninja or Shinobi is capable of housing a huge amount of Chakra, they have a wall, above that, they can't have more Chakra.]
Kakashi nodded and said, "Only aside from Ashura and Indra's reincarnations, right?"
[Ashura and Indra are Ōtsutsuki's, whose bodies and minds are capable of housing Tailed Beast's level reserves. But, no shinobi can push the boundaries of the limit, human bodies limits to permanently possessing Tailed Beast's level reserves by themselves.]
[However, system has bypassed that limit for Host, overwritten his "human template", so that he can have Chakra reserves equal and even higher than Ten-Tail's in quantity. And this also passively increases Host's Yang and Yin Release Chakra.]
[However, These are the inevitable outcomes, on which System has no direct involvement. System has only one task, that of raising Host's Chakra without limit.]