The Shinobi Visitor

After his crushing defeat and losing his friends to the Shinju, Naruto thought all was lost. Until the Father of All Ninja rescued him and took him under his wing. Now stronger than ever before, the Jinchuriki and his Tailed Beast partner sets out to find the Four Sealing Keys in four different worlds with different people and different powers. Naruharem. Naruto/multiple crossovers.