Normal high school girl Yui Kusanagi has been living a normal life in the shrine with her parents and brothers, until she stumbles upon a strange glowing sword in the store shed. By touching it, she is transported to another parallel world in the form of a school surrounded by beautiful gardens, with the sword miniaturised as a pendant around her neck. Zeus, the King of the Gods and maker of this universe, tells her that the bond between gods and humans, once intimate, have begun to weaken, which will only bring about disaster in the future. To avoid a terrible future, Zeus tasks Yui to teach…