One day, God grows tired of being omnipotent and decides to experience mortality.
He creates a being named Zeno and grants him all of His divine power.
Then, he seals his own soul within Zeno, ensuring that each time Zeno dies, he will be reborn into a mortal body.
Thus begins God's journey through mortal life.
In the first world, he reincarnates in Neji's body from Naruto.