Sora no Otoshimono, Haiyore! Nyaruko-san Recommendations
Beings from earth enter main characters life.
Cute girls end up living with protagonist.
Protagonist hits the girls when they say something they deem inappropriate (at least I think Ikaros gets hit on the head a few times early. Tomoki doesn't abuse the angeloids much at all.)
Same art style.
Both very funny.
"I just want to live a calm and peaceful life" - That's what the main characters of both series wanted. However, they both meet a non-human girl in awkward situations and their lives are completely transformed. Comedy, supernatural powers and a bit of ecchi is what you will find in these two anime.