Schwindelmagier

Here's a trailer of the anime Sora no Otoshimono based off of the manga series by Suu Minazuki

Small summary from www.mangaupdates.com:

Sakurai Tomoki is a normal student whose motto is "normal is the best". If there is one thing abnormal, it is that he often dreams of a girl whose face he cannot even remember, and when he wakes up from that dream, he would always be crying. He tried leaving it as just a dream... but one day, from the sky, an angel descended.

Aaand the trailer!