Ashiaraiyashiki no Juunin-tachi.

Also known as:  The Residents of Ashiaraiyashiki.

The OVA adaptation Ashiaraiyashiki no Juunin-tachi. is based on a "battle fantasy" manga authored by Tokuichi Minagi, and bundled with the manga's 10th volume. The story follows the humans, mythical creatures and demons that live together in a mysterious apartment called Ashiaraiyashiki. (based on ANN synopsis)

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Producers, official website and other details: AniDB, ANN. Search on: Wiki.