For centuries, a deity called Celestin was confined to the moon after treason against Yggdrasil's realm. Freed by the sprite Morgan Le Fey, Celestin journeys to Earth to reunite with his former disciple, goddess Belldandy. Chaos ensues when Celestin wipes Belldandy's recollections of boyfriend Keiichi and employs her as a trigger to unleash turmoil across Earth and Yggdrasil and the vast celestial expanse.