Ashiaraiyashiki no Juunin-tachi

Ashiaraiyashiki no Juunin-tachi (足洗邸の住人たち) is a Japanese manga series serialized by "Comic Gum" from 2001 to 2002. It gained an OVA adaptation on March 25, 2010.

Plot
More than twenty years ago, an evil summoner committed the "Great Summon", with devils and monsters wiping out one-third of humanity. One day, a painter, Tamura Fukutaro, moves into an apartment house called "Ashiaraiyashiki" and gets involved in the troubles of his non-human neighbors. It's the beginning of a severe battle among gods, devils and the ruler "The Central".