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.
More than twenty years ago, an evil summoner committed "Great Summon". One third of human beings were killed, and devils and monsters invaded the Earth. 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".