"ARCH" is about the adventure between a young girl and the faceless desert warrior that she befriends. M1K3, a fierce some being brought to life from the sand upon the interaction with Lilly. Together the two of them travel the wasteland, and after a short while, M1K3 discovers that Lilly has fatal radiation poisoning, a staple of the nuclear desert. The two of them decide to journey to "the safe place" in order to find a cure for Lilly, but to reach it they have to venture through Babylon, the wicked fortress of the wastes, and face the demons that lie within.

History's greatest warriors, including Genghis Khan and Joan of Arc, are summoned by a shadowy organization to fight in a battle to the death. But unknown to their captors, the fighters have been plotting to turn the tables and dismantle the deadly enterprise from within.