Naruto: Going back in time!

In search of a very dangerous alien, Yato Ken, a Tokubestsu-jounin from Konoha were It's assigned to help with the search. But, an unknown technique of the same opens a portal in Konoha, and sucks Yato Ken back into his past where everything is yet to happen! see how he lives his second life, and makes choices he didn't make in the past.