Kei wakes up lost in a mountain and decides to wander so that he can find a way to return, then he encounters a God who he starts calling Tama, who receives him on his home and gives him all kinds of attentions. At night Kei finds him very tired and Tama explains that it's been so long since he used that much power and that to recover it he needs life energy from a mortal.
Kami-sama wa xx ga Osuki