If you liked the Sora no Otoshimono anime, the Anime-Planet community thinks you'd like:
A young woman quietly falls to the earth, escorted by a solitary crow. This sort of dream, as many other before have dreamed, comes just before being reborn as a Haibane, a charcoal-winged angel. On the outskirts of the walled-in city lies Old Home, a haven for Haibane to study, live, and learn, while waiting for their chance to ascend to the heavens and escape the confines of their new world. Rakka is the newest inhabitant of Old Home who wants nothing more than to remember her past and discover the secrets of her kind. Together with Reki, Kuu and plenty of other new friends, Rakka will laugh, explore, and search for the meaning of their existence in the process.
Other than maybe a little of the melancholy of SnO, the stories are completely different, but, if you want another show that focuses around mysterious girls with wings, then Haibane Renmei would be a good show to try.
The timid, virginal Kouta is a new student at Kunpo High School; and while others in his situation might be a wallflower forever, Kouta has no such luck – he has attracted the attention of the busty Chizuru, who happens to be a fox deity! However, Kouta’s misfortunes don’t stop there; he’s also pursued by Nozomu, a wolf deity. Between being molested, propositioned, having his face shoved between mammoth breasts or witnessing endless panty shots, Kouta must also attempt to maintain his studies – even though all Chizuru and Nozomu want is to be the one to deflower him first!
Both these titles are wrapped up in Ecchi and humour. Although Kanokon is more 'tame' than Sora no Otoshimono both are somewhat of a fantasy/sci-fi type romances. They both show different sides of their story, with Sora no Otoshimono having an aggressive (trying to get girls) protagonist and Kanokon having the passive (trying to be won over) protagonist.
Yuuto Amakawa has had a tough life. Seven years ago, both of his parents were tragically killed in a car accident, leaving him without a single living relative. His friend Rinko Kuzaki has taken care of him every since. Yuuto's sixteenth birthday has arrived, but instead of a birthday gift of a normal life he meets Himari, a catgirl samurai who swears to protect him. Within weeks Yuuto's life is thrown into chaos as his family's dark past comes to light. With demons appearing around him, Rinko and Himari fighting for his attention and a sinister plot beginning to surface, can Yuuto live the normal, safe life he wants so badly?
Besides the fact that both animes are bombarded with countless ecch scenesi and having that one annoyinng close friend, both animes are about a protagonist who meets a woman of a different "species". Meeting them sheds a new light on the protagonist and they have to conquer the endeavors that come with it.
Fifteen-year-old Tsukune Aono is average in every way; he has no hobbies, less-than-stellar grades and he's even flunked his high school entrance exam. His parents have managed to enroll him in a school, but it's no ordinary school! Tsukune will be attending the Youkai Academy, a place where monsters learn how to co-exist with humans! As the werewolves, vampires, witches and other monsters are required to retain their human forms, Tsukune - the lone human - is able to avoid their bloodthirsty gazes. However, he quickly attracts the attention of a number of devilish beauties including the vampire Moka, a busty succubus and even a young witch! It seems Tsukune's average life isn't so average anymore!
Kaede is a devoted high school student who lives with her adopted brother Rin. She holds a quiet confidence that one day, when Rin finally starts showing interest in sex, he will make the obvious choice and turn to his loving sister. But what Kaede wasn’t counting on was the lords of heaven and hell coming to Earth, wanting Rin to mate with their nubile daughters! Rin, like any teenager would, takes full advantage of his newly acquired harem; but how long can he keep up his carefree, boxed-lunches-on-the-rooftop lifestyle, as the horde of girls on his tail grows?