Ah! Would It Be Okay If I Were a Demon?!
Belldandy returns home with her reissued license. With it, she tries a spell but something goes wrong; her license is for demonic powers! As her sisters go to heaven to get it fixed, Belldandy spends time with Keiichi, but with the Ultimate Force working for evil, just about everything goes wrong. Whenever Belldandy tries to fix things, it has an ill effect on Keiichi. According to Marller, Belldandy will have to resort to being a demon to save him!
Aired 07/09/2006EP 21 - Ah! Would It Be Okay If I Were a Demon?!

Oh! My Goddess: Flights of Fancy
The song may say "thank heaven for little girls", but who is college student Keiichi Morisato supposed to thank when three honest to goodness Goddesses move in and take over his life? After all, according to most mythologies, relationships between mortals and immortals usually leads to mortifying complications, so we're already talking about an extremely mixed blessing!
(Source: Crunchyroll)