For one reason or another -- whether because of, say, a virus that wipes out the world’s male population, or a jutsu that turns all men into girls, or a sadistic goddess that renders all other men sterile/impotent/eunuchs -- Naruto Uzumaki is now the only fertile man left in a world full of women.
All those girls who may have before said of Naruto “Not even if he was the last man on earth” are now to eat their words (and his dick) for the sake of ensuring a new generation, and the continued survival of the human race. Luckily for all, there is plenty of Naruto to go around...
Evil Illustrator