Ah! My Goddess Season 1 Episode 21 Ah! The One I Yearn For Is A White-Winged Angel!

Belldandy is going to meet her old mentor, Celestin, who taught her how to use her powers as a goddess. Celestin has been in the sealed room of the Goddess temple, and he is going to be released. However, he has plans of his own, and his intentions may not align with those of the other goddesses. Meanwhile, Keiichi has feelings for Belldandy and is worried about her rekindling her relationship with Celestin. The episode follows the interactions between the characters as they navigate their personal relationships and deal with the potential threat posed by Celestin.