Well it is my first story writing and I'm not good at English so don't blame me.

I don't own Naruto or anything it's their franchise and Masashi kishimoto work.

This story starts when Toneri realise that Boruto is too young to get strong to fight otsutskis and when he had a vision of Urashiku petrifying him he knew that he has to do something.

But he can't give Naruto Jougan now with his work as hokage he won't be able to grow stronger so he using residual of the Tenseigan chakra he went back in time and after orochimaru used 5 prong seal on Naruto. When Naruto and sasuke were unconscious he went and gave Naruto the ability to awaken jogan but unlike Boruto he can't awaken it directly because of Toneri's less chakra his low otsutsuki chakra. so, Naruto has to work very hard in order to gain the jogan through the method of evolution of dojutsu.

And after an year of Toneris petrification we see Isshiki getting his ass wooped by our own favourite blonde hokage but even in baryone mode he is losing its power but when he used all his might and punched Isshiki, otsutsukis life energy slipped out and he has few minutes at best. So,he has to think and think fast, he can't put karma seal into Naruto or sasuke they had so6p power that might overwrite his seal so he decided kid Naruto would be his best option since he won't be able resist his chakra, he also like Toneri used time travel technique and went to past he met Naruto being pushed into cavern by jiraya to draw out kyubi's chakra. At that movement he used sukunahikona making himself small and went near to give his karma seal and he sensed somebody given him the ability to awaken jougan and it made him even more happy to have a strong host to ressuruct and he pushed his chakra into Naruto while falling.

Naruto p.o.v:

When jiraya pushed him into cavern by saying 'if you want live,draw out kyubi's chakra' and that made him both angry and determined to become strong at the same time he felt lot of pain in his left hand. But he didn't give it a thought due to his life being in line at the same time Isshiki pushed his chakra into Naruto to overpower his will to make his host,but, our blonde will is the strongest and determined to live this caused a lot of chain reaction to occur.

First being overpower by naruto's will Isshiki karma seal turned in to white karma seal and destroyed Isshiki soul except for his chakra, power given to Naruto and DNA will be overwritten to Naruto with all its power and secondly because of increase in chakra and pain Naruto awakened combination of sharingan byakugan.but summoning toad boss Gamabunta and chakra exhaustion he subconsciously deactivated his new dojutsu.

Here Naruto doesn't know he awakened dojutsu because he was in talk with kyubi in mindscape because of discussion kyubi also didn't notice either of jogans or Isshikis' karma seal implant.