Kusanagi Yui is the daughter of a Shinto shrine. One spring day she finds a mysterious sword in the cellar, and its power pulls her into an unfamiliar world. There she meets Zeus, who explains the problem: the weakening bond between gods and humans is producing negative effects throughout the world. His solution requires Yui to attend a school in a garden world he created, live alongside gods who are having difficulty relating to humanity, and teach them — through direct experience — what humans are and what love means.