This is an otherworldly fantasy set in a world called "Archaia ." The inhabitants of this world are threatened by monsters called "Noise," and in order to eradicate them, a being called the "Golden Diva" summons a being called the "Conductor" from the real world (Earth). The Conductor summoned at this time becomes the player character . The Conductor is a being who can operate a robot called the "Absolute Phono Cluster" in Archaia , and together with their other half, the "Maiden," they throw themselves into a battle called the "Hero War."