Aa! Megami-sama! Sorezore no Tsubasa

Both are romantic comedies ( air is not as funny but still) with "Supernatural" theme. Both main female characters are really sweet and inocent girls that enjoys the company of the male character ( wich also have similiar actitudes). 

Both have a girl that came from a weird place living with a shy regular boy. And both make a very shy couple. Side characters are also very similar and the voice actress for Sensei and Belldandy is the same. 

well both are a shonen romantic comedy and are simular by the fact each male is surrounded by women and it's just as funny but not as well drawn read my review to learn more