Knights in the Nightmare is a tactical role-playing game for the PlayStation Portable set in the realm of Aventheim, an ancient castle between heaven and the underworld. After a devastating attack by netherworld creatures, a wisp awakens the spirits of fallen knights. Players strategize battles against various monsters as they guide the knights back to their stronghold to confront the evil that destroyed them.
Somewhere between heaven and the underworld--in the center of a quiet lake--stood an ancient castle known as Aventheim. One night, without warning, denizens of the netherworld emerged and slaughtered the kingdom; nary a soul was left alive. Within an abandoned, long-forgotten church deep in the woods, a wisp is set free. Bereft of memory, it is drawn toward a monster-infested castle and re-awakens the souls of vanquished knights, leading them back towards the fallen stronghold to confront the very forces of evil that took their lives.