The Third Gate - Curtis Yost - Bog

Jacob Smith is a man who loses his life trying to save a young girl from an accident. Upon dying, he comes across an angel that sends him to a second world ruled by the Devil himself. The devil refers to himself as the Demon Lord has ruled the lands without people knowing. Jacob must grow up and evolve to become the one whole defeats the Demons Lord and bring peace to the world while fighting his own curse.