In 2089 AD, the earth experienced a global disaster known as "Ashfall." The cause was a failed quantum experiment that tore apart the dimensional barrier, resulting in:
• "Black Tide": An unknown energy body pours into the earth, swallowing technology, distorting living things, and rewriting the laws of physics.
• "Ember": Mysterious crystals born in the black tide, which can give humans supernatural powers, but also bring madness.
• "Echoes of the Past": The existences in ancient myths begin to awaken. They are not fictions, but "original species" sealed by dimensions.
The world collapsed, civilization receded, cities were reduced to ruins, and order collapsed. Human beings rebuild settlements in the ruins and compete with mutants, fallen ones, and old beings for the right to survive.
