It is said that there comes a moment every day when the Man Sitting upstairs listens to you prayer. On such moment Sora on his dead bed while taking his last breath prays to Almighty God to protect his baby sister in return He sends some people for the said work. Who is better guardian than Naruto and his girls?
Normal people have friends with benefit. But Naruto has a family with benefit. And it is not normal. But hey what is normal about Naruto. Dont answer it, its a rhetorical question. Lemons and incest. Relatively peaceful world.
In a hope to have some adventure and a misssion to complete Naruto and his girls visit earth where the girls asks Naruto to leave them (Not in a rude way) so they could have girls only Adventure/mission trip. On his lonely trip he meets Monkey. D. Luffy and foresees a great adventure with him thus deciding to become his crew mate. Naruto x harem
In the history of human-kind there were many civilization. They came, strive hard and reached top point. And when they reach top point whether positive or negative they fell down. Uzumaki were the same, they came, strive hard, reached their pinnacle point and fell in the Second War. But unlike other civilization they will re-rise with force 2 times than the last.
People do Space travel for fun and vacation, while some people do Time travel to save their loved ones from some horrible fate. But Naruto here in order to satisfy the curious worm in him performs a Time-space Ninjutsu. Now he will have the fun and he is required to look after his loved ones. Major OOC-ness of various characters.