Sora no Otoshimono

Synopsis

Tomoki Sakurai wants to enjoy "peace and quiet", but he has recurring dreams that involve an angel. When classmate Eishiro Sugata spots in the sky an abnormal structure that resembles a black hole, he convinces Tomoki, childhood neighbor Sohara Mitsuki, and student council president Mikako Satsukitane to join him for an investigation at a cherry blossom. Tomoki, being the only who shows up, witnesses a girl with wings falls through the hole, along with several large pillars, scaring him to death. He overcomes his fears and rescues this girl, who calls herself Ikaros. Calling herself a Pet-Class Angeloid from an unknown world called Synapse, she considers Tomoki as her master and tells him that she can grant him any wish. Using this to his advantage including a perverted scene, he gets carried away with what he would wish for. When Tomoki jokingly commands Ikaros to make him ruler of the world, this only causes everyone to vanish, since nobody would accept him as such. Ikaros suggests killing herself, seeing how upset Tomoki is, to which he affirms. As she creates a gun and readies to shoot herself, Tomoki stops her and says it was only a joke. Although he cannot undo the wish, he is able to make a different one, wishing that this was all a bad dream. Tomoki wakes up and everything is back to normal, except Ikaros is here to stay.

(Source: Wikipedia)