5 6 years

In a forest, a boy could be seen training in a forest. This boy was obviously Kira.

Kira was now 6 years old. He looked a little taller than normal kids his age. Kira had short black hair, snow-white skin, and blue eyes that looked cold as ice. He was wearing a white shorts and was shirtless.

He was currently striking a tree with Sakabatou. Just a simple blow, no sophisticated moves and also no technique.

He had gone through this process countless times, and despite being a baseless blow, that blow was undoubtedly strong. At least enough to hurt a Low Chunin

During these four years, Kira trained mainly his body, since he did not know techniques of fencing. Kira trained his body with great dedication, since it was still a long time before he could move Shusui.

Kira during these 5 years also studied their swords. He discovered that in addition to Shusui, the others appear to be normal swords. He tested Murasame on a snake, which attacked him when he was training. It seems that, although it is sharper than an ordinary katana, Murasame did not possess the same abilities that Kira knew.

Kira normally trained with Sakabutou, hitting straight and simple blows on trees. Kira while training, sleeping or meditating, is always wearing weights on his wrists and ankles.

At first he used only 10 Pound weights, but now he uses weights over 1200 Pound each. Kira knew he would have to train more than the others if he wanted to be strong, but that only motivated him to train even more.

In these 5 years, besides training, Kira also studied everything about this world. Kira planned to enter the Academy to learn some even basic combat techniques.

The plot did not change much from the original in those 5 years. Hiruzen was once again the Hokage, Naruto was hated by everyone, and Konoha had slowly been rebuilt.

Kira was currently living in an orphanage, since he was not old enough to live alone. Hiruzen began treating Kira as his grandson since his mother died to save him.

After Mio died, Kira's personality changed. He treated everyone coldly, and rarely talked to anyone, even Hiruzen was no exception.

...

After finishing his training, Kira returned to the orphanage. It was already dark when Kira finally arrived.

A time after Kira arrived at the orphanage, a member of Ambu arrived in his room, informing Kira that the Hokage wanted to talk to him. Seeing Kira nod, Ambu took him to the Hokage's residence.

On the way to the Hokage's residence, Kira thought about why Hiruzen would want to talk to him so late.

"What does the old man want with me? Has something important happened or will it happen?" Kira wondered.

...

"What is it, you look so cold, how can you get a girlfriend like that?" Hiruzen asked Kira as she laughed.

A hint of a smile appeared on Kira's face.

"Why did you call me old?" Kira asked in a calm voice.

"Well, tomorrow you will go to Princess Hyuuga's birthday. I wanted to warn you, since you would probably just train and forget." Hiruzen spoke in a calm voice.

"I already told you that I will not go on this birthday! Why would I waste my time on such a useless thing?" Kira said, a little irritation in his voice.

"... I know you do not like to approach people, but please do this only this time. I will accept any request from you, if you agree to attend this party." Hiruzen asked, with concern in his voice.

He knew Kira did not approach people for fear of losing them. He was worried that he would never have a friend if he continued like this.

"... Will you really accept any of my requests?" Kira asked with a strange gleam in his eyes.

"Yes, as long as it is within my ability." Hiruzen replied without hesitation.

"... So I want someone to teach me how to use swords." Kira asked Hiruzen with a little excitement.

"Eh, that's it?" Hiruzen was shocked, as he had already prepared himself for some impossible request.

"Yes, that's what I need most at the moment." Kira replied quickly.

"HAHAHAHA. Since that's just it, then it's a lot simpler!" Hiruzen burst out laughing, relieved that Kira did not ask for something complicated.

"Well, then I'll go to that party." "More garlic?" Kira spoke calmly.

"No, you can go." Hiruzen said, with a smile on his face.