oh my goddess!
By Kosuke Fujishima
US release by AnimEigo (subtitled)
Description from the Anime Pocket Guide:
One day, Keiichi, a student at Nekomi Institute of Technology (or NIT) was in
his dorm because his sempai told him to wait for a phone call. While
waiting, he got hungry, so Keiichi called out for some food. He dialed the
wrong number and got the "Goddess Helpers" office instead. A young cute
goddess named Belldandy appear out of the mirror and said, "Our job is to help
people who are in trouble, like you. I can grant you one wish, no matter
what it is..." Keiichi said, "I want you to stay forever." The wish was
approved. Unfortunately, Keiichi lives in a men-only dorm, so he got thrown
out when his sempai returned. Keiichi's friends didn't let him in either, so
he and Belldandy finally settled in an old temple...