After learning that he doesn't need to do any mission for the time being, Kakashi's mood has become better.

After all, doing mission all this time has make him tired.

In the past three years, Kakashi has performed hundreds of big and small mission, and the frequency is high, which is a little unbearable for Kakashi.

Now it seems that he should be able to have a vacation for a while, which is really a good thing.

Kakashi didn't go home immediately, but went to Anbu's base first, and told the members of the sixth team that he had to rest in the near future.

Kakashi then left Anbu Great Hall as people are looking at him with envious look.

For Anbu, taking a long vacation is really an enviable thing.

Working in the darkness all the time, no matter who has been doing it, if it happens for a long time, it will be oppressive.

The relaxed Kakashi went to Ichiraku ramen to get a good meal.

He then saw the familiar Teuchi and Ayame inside as he order some ramen.

But he is feeling some regrets that he didn't meet Naruto here.

Kakashi doesn't mind too much about it, after all he is in the vacation period, and there will be some time for him to meet Naruto.

In the Hatake clan building, Kakashi sat on the floor and held a kunai with his hand.

There is a big difference between this kunai and normal kunai. This kunai has three blades instead of one. The handle is also thicker that usually serves as the "marker" for Minato's teleportation ability who used Flying Thunder God Jutsu. The difference is that there is no imprint of Flying Thunder God Jutsu in this kunai.

This is Kakashi's own re-customization kunai that he orders from Konoha's shinobi store.

In the past, Minato was also purchased his kunai from this shinobi store, so this kunai does not seem to be that much different from the one Minato had.

Kakashi's reason for buying this kind of kunai is more of respect for his teacher, Minato. Since he is now studying his teacher's Ninjutsu, it is understandable to use this kind of kunai to remember about him.

"Everything is ready, then, I should start now."

Kakashi grip the Kunai in his own hands, and his Chakra constantly pouring into the kunai, wanting to engrave his own Flying Thunder God Jutsu formula on it.

In less than a moment, Kakashi had a cold sweat on his head, and there were some mysterious symbols in his hands that were constantly climbing into the kunai, but they were not able to be engraved on the kunai.

Suddenly, with a bang, the kunai is broken!

Kakashi put down the kunai and calm his breathing.

"How could this be? Hasn't I completely learn about this Ninjutsu? I should be able to imprint this kunai right now."

Kakashi's heart is full of doubts. Whether it is the formula and technique to use Flying Thunder God Jutsu or the understanding of Space, Kakashi has clearly completed all of them. So why can't he imprint the kunai?

Kakashi frowns, obviously not understand about what happens.

"Let's try again!"

Kakashi then start to make the Flying Thunder God Jutsu formula, but this time he didn't imprint it on the kunai, but instead he chooses to imprint it on the ground.

Kakashi pressed the palm of his hand to the ground, and his mind now constantly remembering about the work Flying Thunder God Jutsu and his perception of Space.

"Hhaaaahhh!"

With a light crash, Chakra in Kakashi's right hand flows out of the palm in a strange flowing manner, forming black symbols.

Kakashi looks at this and knew that this time he should be able to imprint it.

He then sees that the black symbols are slowly moving, forming a black dart pattern!

"This is!"

Kakashi's pupils shrank, obviously shocked to the extreme!

This imprint pattern is the same as his Mangekyō Sharingan!

Just then, the black dart's pattern collapsed directly and disappeared into the ground.

But Kakashi is still in a shock.

"What is going on here? Why is Flying Thunder God Jutsu formula become like this?"

If he remember correctly, Minato's formula should be the endurance, love and sword. After learning from Minato, why did his Flying Thunder God Jutsu formula is not endurance, love and sword but become the pattern of Mangekyō?

To make matters worse, he still can't use this successfully.

Minato's Flying Thunder God Jutsu formula is different from Nidaime Hokage's Flying Thunder God Jutsu formula. It is because even if Minato learn it from the one Nidaime Hokage created, he adds his own technique so that has made it different.

But Kakashi is obviously studying Flying Thunder God Jutsu from Minato and didn't change anything. So why is it different?

Kakashi is lost in thought.

Suddenly, Kakashi remembered one thing.

'My own Flying Thunder God Jutsu is not necessarily the same as Minato-sensei!

At that time, the information about Flying Thunder God Jutsu was not only obtained by the Raido's group, but also because Mangekyō Sharingan engulfed Minato-sensei's special kunai, after which it send information to my mind.

Could it be that...'

In the process of learning the Flying Thunder God Jutsu, there were some subtle changes because of his Mangekyo Sharingan.

It is just that Kakashi doesn't know about it.

The more Kakashi thinks about it, the more likely it possibility is, and it seems that there is no other explanation except this.

Otherwise, it is impossible to explain why his Flying Thunder God Jutsu formula becomes the pattern of Mangekyō.

"Since the pattern of the formula can be explained, why can't I use it successfully?"

Kakashi is caught in another problem and it is the most important issue.

Kakashi can say that he has put a lot of effort into studying Flying Thunder God Jutsu, as it was already for three years. If he is not able to use this, it will be really frustrating.

As he touching his left eye Kakashi starts to thinks, 'Since the pattern is the same as Mangekyō, perhaps the answer is in this Mangekyō.'

Thinking about this, Kakashi directly opened his headband.

The seal of the left eye was instantly removed, and the three black Magatamas turned wildly, forming a black dart pattern.

His right hand was pressed again on the ground, and he tries to imprint the ground with Flying Thunder God Jutsu formula again. Then, black symbols start to spread out of Kakashi's palm.

The black lines are constantly moving on the ground, and it starts to form a pattern.

Mangekyō in his left eye keeps turning, and the Chakra in Kakashi's right hand is constantly pouring.

'It's now!'

The black symbols condensed and eventually formed a complete black dart pattern.

'Successful?'

Kakashi finally relaxed, looking at the pattern on the floor, he is very happy.

'I finally succeed'

After this, he quickly seals his left eye again, and he then left the room, and walked to the yard.

He starts forming hand seals and slams his palm on the ground. Kakashi then disappeared from the yard, in the next second, he appeared inside of the room.

"Success, I finally mastered the Flying Thunder God Jutsu. Although I am still not very skilled in using it, I have been able to use it. However, my Flying Thunder God Jutsu seems to need Mangekyō's Ability."

Kakashi is helpless.

If Flying Thunder God Jutsu really needs Mangekyō to imprint the formula, then the practicality is greatly reduced.

"Maybe it is just because I'm still not an expert at using it. If the problem is solved later, I will find a way."

Although he hasn't thought of a solution for the time being, Kakashi believes that there must be a way to get rid of the restrictions of Mangekyō from his own Flying Thunder God Jutsu. And by then, the Space Ninjutsu can exert terrifying power in his own hands!