During a proxy war between alien-created machines and human-crafted androids, the story follows the trials of combat android 2B, scanner android 9S, and rogue prototype A2. The story requires multiple playthroughs, each unlocking additional story elements. Gameplay combines role-playing elements with action-based hack and slash combat, and features switch between video game genres similar to that of Nier with elements ranging from shoot ’em up to text adventure.