A Snake's Life

An old man died in his sleep. Upon arriving in a pure white plane. 'God' Told him his wife that he had lost years earlier had been chosen to become the Hero a world needed. The man pleaded with the 'God' to send him as well. And though the God agreed the man would not be born a human. The man accepted anyways. Now he's in this new world trying to Evolve into something that can survive until he meets his wife again. Think he can do it?
Many thanks to Aizen-Sama for the cover.