Training.
It was after the year worth of training, when Naruto and Ken had master there control over kunai's and shuriken.
Ken found it hard to control shuriken and kunai, since Naruto had memories of previous life he was able to control them more efficiently In a short amount of time and consider to be a genius.
But still with extreme hard work and determination Ken was able to make good progress.
Naruto also patiently guided Ken and soon both started training in chakra molding process and chakra control, soon Ken pure bloodline advantage was shown as he was able to control chakra easily and better than Naruto and there role was switched.
After 2 month's both of them were able to climb tree without running and walk water easily.
Ken and Naruto then practice their Tai Jutsu on which Naruto easily beat Ken while there training keep on the tree topic for 3 more year.
At the age of ten both Naruto and Ken were fighting together using Tai Jutsu and kunai while there figure blur due to speed they were moving.
' Yo Ken and Naruto.' Jiraya came out of shadow as he smiled looking at Naruto and Ken training hard, while Jiraya helped them in training as they wanted to surpass Minato a little and they kept this training secret from last 2 years.
Unless without the help of Jiraya they were not capable of hiding there training in the wood from Minato and Kushina.
' hello there pervy sage.' Both of shouted together.
" okay now what I am going to teach you both is called Rasengan and shadow clone." Jiraya smiled as he looked at Naruto and Ken with smile on his face.
Suddenly Ken felt his both eyes going blank while energy emitting out of Ken started affecting Naruto right eyes, causing both of them to shock.
" Uncle perv I cannot see with both of my eyes, uncle." Ken shouted which disturbed Jiraya while Naruto was also holding his right eyes from which blood was oozing out.
Jiraya rushed as he sent sage chakra to check and detect Naruto and Ken eyes which cause the eyes to start absorbing a lot amount of sage chakra from nature while Naruto and Ken fell asleep.
After opening his eyes Ken found himself lying on the ground while Jiraya was sitting by their side and looking at them with astonishment, Ken found that he was able to see Jiraya skeleton, chakra flow and Various energies surrounding them.
After 2 hour Naruto woke up too and was similarly startle by the changes.
After telling Jiraya about their experiences, Jiraya concluded that they were able to see sage chakra from nature while they was able to get them to move into there body which increase there physical power quickly.
Soon Jiraya performed shadow clone which was easily copied by Naruto and Ken because of their respective eyes power, even Rasengan was quite easy for them.
But they still needed practice to master them both.
"thank goodness both of you are alright." Jiraya laughed as he patted ken and Naruto head with smile causing both of them to feel warm inside their respective hearts.
" I am going to be future hokage pervy sage, so how could I die now." Naruto smile as he looked up at sky.
While Ken keep it quiet causing all three of them to laughter.
Soon the day of Shinobi entrance started while Naruto and Ken were eating their breakfast,
" good luck ken and Naruto for your Shinobi training." Minato smiled as looked at Kushina.
" Hmm, good luck both of you, while don't trouble other teachers alright." Kushina smiled as she squeezed there cheeks, causing them to grumble with irritation.
After entering their class they both sat while Ken saw many unfamiliar people's from Naruto anime.
In this world Uzumaki clan was rebuilt in leaf village, Uchiha clan also there but additional to them song illusion clan, and other powerful clan showed up in the class.
Hinata was there while Naruto and Ken were also among favorite's because of hokage father and both of them consider to be genius.
Giving their handsome look with cheerful personality, Ken blue mix golden yellow hair had its own charm.
While Naruto with both red and yellow hair were exception too among black hair colored.