Kamisama no Gakkou - Yaoyorozu Goshinan Itashimasu

Shohei, a high school student, went to visit a shrine with his grandparents as usual. At the shrine, there was a mysterious child who was never there... After returning home, Shohei witnesses his grandfather talking to the child in his room. Surprised, Shohei is told by his grandfather that this child is the god of the shrine he always visits, and that he is the one who serves this god! Furthermore, he says that he will hand over that role to Shohei...