Return of the Gods

In ancient Greece, the world was once brought to the brink of destruction. Seas raged. Skies darkened. Dead walked the earth. Plague and famine consumed all. Even the very earth turned against mankind. The Gods were slain. Slaughtered, by one of their own. Now, thousands of years later, they are returning...but not at all in the way one might expect. Narutoxharem. Slight crossover.