Alone in his dorm on a Saturday night, Nekomi Tech’s Keiichi Morisato dials a wrong number that will change his life forever—reaching the Goddess Technical Help Line. Granted one wish by the charming young goddess Belldandy—a wish for anything in the world—Keiichi wishes she would stay with him always! Complications are bound to ensue from this; the immediate first being the new couple getting tossed out of the dorm—it’s males only! 
As the hapless student and his mysterious “foreign beauty” ride around looking for a new place to stay—risking the different dangers of seeking shelter with an otaku convinced Belldandy is an imaginary woman, and a Zen priest convinced she’s a sinister witch—Keiichi’s still got his classes on Monday morning! How is his new “exchange student” companion going to be received on the N.I.T. campus? A little too well for normal life to ever return... (Source: Dark Horse) 
Note: Won the Kodansha Manga Award for General Manga in 2009.

When college student Keiichi Morisato dials the wrong number while ordering for some food at his dormitory, he accidentally gets connected to the Goddess Hotline and a beautiful goddess named Belldandy appears out of a mirror in front of him. After getting kicked out of the dorm, Keiichi and Belldandy move to an old shrine and soon afterwards, Belldandy's sisters Urd and Skuld move in. 

An Angel Eater has been freed in Heaven. Since Goddesses and Angels share body and soul, losing your angel results in going into shock for the Goddess. Lind goes to Earth to protect Belldandy and the others unknowing that it is a trap.
 
(Source: Anime News Network)

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)

When Keiichi found his grandpa's diary and saw a treasure map inside, Skuld and Urd started to feel a great urge to search it. With the company of his friends, Keiichi arrives to Honda Inn, the place indicated on the map. Once the party is inside, they meet Honda Chieko, who seems to share a certain promise with Keiichi. Apart from all that confusion, it's time for Keiichi to have enough courage to say the words 'I love you' to Belldandy.

Keiichi Morisato is looking forward to university life. But in reality, he has no luck in anything, and he has trouble with clubs, love, etc. The truth is that he has an unlucky star above his head. One day, Keiichi is stuck watching the dorm while his sempai are away, and has a mountain of chores to do to boot. But Keiichi is a good-natured person, and is set about doing his duties. As he is about to finish his final chore, he makes a phone call to his sempai. But the words that came through the receiver are, 'Goddess Help Line.' Shortly afterwards, a beautiful goddess named Belldandy appears in front of him from the mirror of his room. 

Due to the recent events that happened at the end of season 1, the Goddesses are having some stability problems with their body systems. The always adult-looking Urd becomes a little girl and has a fateful encounter with a boy, whereas little Skuld becomes an adult and wants to experiment adulthood together with Keiichi. 
 
Episodes 25 and 26 of Aa! Megami-sama! (TV) that aired separately from it's season 1 original broadcast.

For centuries, a god named Celestin has been imprisoned on the moon for betraying the kingdom of Yggdrasil. Released by the fairy Morgan Le Fey, Celestin travels to Earth to reunite with his former pupil, the goddess Belldandy. Things go awry as Celestin erases Belldandy's memories of her boyfriend Keiichi and uses her as a catalyst to wreak havoc on Earth and Yggdrasil.

OVAs bundled with volumes 42, 43 & 46 of the Aa! Megami-sama! manga. 

Keiichi Morisato was a typical college student, a failure with women, struggling to get through his classes, and in general living a pretty nondescript life. That is, until he dialed the wrong number and accidentally summoned the Norse goddess Belldandy. Not believing Belldandy was a goddess who could grant his every wish, Keiichi wished for her to stay with him forever. As they say: be careful what you wish for! Now bound to Earth and at Keiichi's side for life, the lives of this most un-normal goddess and most lucky human will never be the same again. 
(Source: Dark Horse)

In the story, Keiichi Morisato and Belldandy lived in happiness, but due to the recession, the motorcycle shop Keiichi works at faces financial difficulties. Belldandy starts to search for a job because of the situation.
 
(Source: Anime News Network)

They're cute, they're small, they're... Oh My Goddess! A pint-sized offering of charming four-panel cartoons of your favorite OMG! characters. 
(Source: Dark Horse)

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