Chained Valkyria -Akashiya no Kyouen-

After the recent Sabat, town Canossa at the foot of Midgar became deserted.

Initially town was under assault of demons, so adventurers were called to pushed them back. After their return governor was found lynched by the angry mob and his residence burned down. The abandoned building became home for ghosts. Then governor's tomb collapsed together with the cliff. Then soil was dug in the wrong place, and river flooded living quarters. Demons showed up in all this chaos. Black fog, red skies, and jet-black moons filled the sky.

Adventurers sent to save this town from demons, got trapped in this nightmarish world.

[From vndbreview]