Sora no Otoshimono Forte (its real long name) is a romantic comedy manga with some elements of fantasy. It started to be serialized in Shonen Ace magazine in 2007. The rapid success of this story impulsed its adaptation to anime in 2009 with 13 episodes.
Now the second season will premiere on October 1.
This is the story of a boy named Tomoki Sakurai, a high school boy that just looks to live his life peacefully. The perverted type, he often looks to spy on girl's locker rooms and/or bathrooms. He always wakes up in the morning crying because he always has a same horrible nightmare that he cannot remember well. His friend, Sohara Mitsuki, tells him to go meet Sugata, who may know the answer to his worries. Sugata believes that it's all related to a strange black hole in the sky that appears every night in the sky of the city, Soramani, so they decide to investigate.
But Tomoki goes alone and sees that from the black hole came a rain of meteorites, along with a girl with the aspect of an angel. He rescues the girl, turning out to be an angeloid, a special being created in New World Synapse, the other dimension if you get into the black hole. They must follow the orders of the Master at all cost, being always united by a mythical chain to him.