Description:

Amane lives alone in an apartment, and the most beautiful girl in school, Mahiru, lives just next door. They've almost never spoken-until the day he sees her in distress on a rainy day and lends her his umbrella. To return the favor, she offers him help around the house, and a relationship slowly begins to blossom as the distance between them closes... (Source: Yen Press)

Alternative Titles:

お隣の天使様にいつの間にか駄目人間にされていた件, She is the neighbour Angel, I am spoilt by her., The Case of the Neighbourhood Angel Turning into a Degenerate Unaware, Otonari