Nice Guy Keiichi is doing his best as a poor student at a tech college, but his good nature is taken advantage of relentlessly.

In a world where humans can have their wish granted via the Goddess Help Hotline, a human, Keiichi Morisato, summons the Goddess Belldandy by accident and jokes that she should stay with him forever. Unfortunately for him, his "wish" is granted. Suddenly, Keiichi is now living with this gorgeous woman all alone, causing him to be kicked out of the all-male dormitory he was staying in. But soon, after they find lodging in a Buddhist temple, Keiichi and Belldandy's relationship begins to blossom. Although they are both awkward and rather uncomfortable with one another at first, what awaits these two strangers could turn out to be an unexpected romance.—MAL Rewrite

Morisato Keiichi is looking forward to university life. But he does not have much luck with anything, be they clubs, love, or daily life. And as it turns out he actually was born under an unlucky star. One day Keiichi is stuck with having to watch the dorm while his fellow seniors are away at some party, and to make things worse a mountain of work was forced on him. But good-natured - and easily taken advantage of - Keiichi goes right to work, and after finishing his chores, he makes a phone call. For once fate smiles on the hapless lad, and he reaches the Goddess Help Line. A moment later, a beautiful goddess named Belldandy exits the mirror in his room. But will the goddess help to finally end Keiichi's unlucky days?—AniDB

Keiichi Morisato is looking forward to university life. But in reality, he has no luck in anything, and he has trouble with clubs, love, etc. The truth is that he has an unlucky star above his head. One day, Keiichi is stuck watching the dorm while his sempai are away, and has a mountain of chores to do to boot. But Keiichi is a good-natured person, and is set about doing his duties. As he is about to finish his final chore, he makes a phone call to his sempai. But the words that came through the receiver are, 'Goddess Help Line.' Shortly afterwards, a beautiful goddess named Belldandy appears in front of him from the mirror of his room.—Anime News Network