Kamiyama Samataro, a second grader of high school, is the eldest son of God family. He is living with his father who is God, the mother who is a goddess, his sisters who are candidates for goddesses, and a help, Tenko, who is his childhood friend and an angel. They are living in a house built 25 years ago in Setagaya. The reason why they live in the human world is because they make Samataro study human world in order to become God.