It's been about 10 years since the mysterious disaster that made the air toxic to breathe. Now humanity lives in the last stronghold known as the new city of Zenkuirs that protects humanity from the toxic air known as miasma. Only with a giant robot called astral gear can humanity break through the thick fog of miasma to create a new light of hope amongst the darkness. Or that's what this flyer says because I'm just a mechanic tasked with maintaining the astral gear to keep it usable.