Being a victim of the ARCH ULTRA, a secret governmental project, Paul has lost all his memories about himself. Saved by a man named Lucien, he gets involved into a political conflict against his will. He must work for a rebel group who oppose the Architech government in exchange for protection against The Party. Being very lost, he works with a girl named Rosia as he attempts to recall the memories that he lost and learn more about the world that surround him.
ARCH ULTRA is a visual novel set in fantastic cyberpunk dystopia, in a world inhabited by humans, elves and vampires. In a world where democracy is going to abolished in a democratic way, the Helliosians considers themselves as the people who can think critically. Will they manage to convince the public before it is too late?