Belldandy's mentor Celestine breaks free from imprisonment on the moon and comes looking for her on Earth, aiming to turn her into a weapon against the divine system she serves. He begins erasing her memories of her boyfriend Keiichi Morisato, straining the household she shares with fellow goddesses Urd and Skuld. As Belldandy's bond with Keiichi unravels, the threat Celestine poses widens from their apartment to the heavenly system of Yggdrasil itself.