Sora No Otoshimono is about a pervert guy called Tomoki who meets a lost angel who becomes his slave and grants him all his wishes.
This anime is a really good comedy, the mc and the rest of the characters are super lovable and the art-style is amazing, at least I love it. The plot isn't that huge of a deal and some parts of it don't make sence at all... but It's really funny anyways. Thing is... It's always the same thing, it gets kinda boring after a while but... if you're really into typical ecchi comedies, you might have a good time with this one.