Echoes of the Dark Abyss

This is a world shrouded in the dreams of the "Sleeping God". The boundary between reality and illusion is blurred, and civilization has left layers of ruins and taboos in its wake. The world is divided into two parts by a barrier called the "curtain": inside the curtain is the mortal world, and outside the curtain is the "dark abyss" - a terrifying realm full of unspeakable beings.