N.R. Wick's Dark Ascension is a three book Young Adult series set in a post-apocalyptic world where humans are in hiding from demons.
Included in the series:
"Land of No Angels" by N.R. Wick on Ganxy
"Land of No Mortals" by N.R. Wick on Ganxy
"Land of No Demons" by N.R. Wick on Ganxy
Additionally, an anthology of short stories and flash fiction called Dark Ascension: A Demon Anthology is included within the Dark Ascension series and is set in the same world but explores the events leading up to the Ascension, the event that caused the demon apocalypse.
-Dark Ascension: A Demon Anthology