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!
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(Source: Crunchyroll)

Episode 1 - Ah! I Wish...Once More!

Episode 2 - Ah! The Beleaguered Queen of Vengeance!

Episode 3 - Ah! I Offer These Feelings on Christmas Eve!

Episode 4 - Ah! I Want To Fill The World With Happiness!

Episode 5 - Ah! Well-Matched Vibes of Love!

Episode 6 - Ah! Is That Jealousy?!

Episode 7 - Ah! I Shall Grant Your Wish!

Episode 8 - Ah! I Want to Be of Use to You!

Episode 9 - Ah! The Goddesses Go Head to Head on a Date!

Episode 10 - Ah! I Just Can't Say It!

Episode 11 - Ah! Grasp Your Dream With Your Own Hands!

Episode 12 - Ah! A Goddess's Tears and His Dream!

Episode 13 - Ah! Let Those Feelings Awaken!

Episode 14 - Ah! My Darling Cupid!

Episode 15 - Ah! I'm Half Goddess, Half Demon?!

Episode 16 - Ah! Shimmer Without Fear of the Darkness!

Episode 17 - Ah! The Chair of Demonkind Descends!

Episode 18 - Ah! Do Demons Have Any Dignity?!

Episode 19 - Ah! The Love of a Goddess Saves!

Episode 20 - Ah! It Doesn't Matter Where, So Long as We're Together!

Episode 21 - Ah! Would It Be Okay If I Were a Demon?!

Episode 22 - Ah! The Goddess's Confession!

Episode 23 - Ah! Everyone Has a Destiny!

Episode 24 - Ah! The Song of Love That Shakes the Heart!

Funimation

Kodansha

Oh! My Goddess: Flights of Fancy