Samatarou is not your typical high school student; he is the son of a deity, his mother is a goddess, and his sisters are goddess candidates. They are in the human realm because they want their kid to learn about human customs and the behaviors of the creatures they are protecting, so that Samatarou can become a greater deity. Tenko is an angel tasked with looking over Samatarou. She and Samatarou were born on the same day and year, and they've been best friends ever since. Life appears to be regular, but things begin to change with the arrival of a transfer student called Kumiko. Samatarou falls in love with her, and everything will change from now on.