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Prima Doll centers around the Automata, advanced mechanical dolls, who are attempting to find new meaning in a post-war world. These Automata, particularly those working at the Black Cat Cafe, are grappling with their past as weapons of war.
The story specifically follows Haizakura, an Automata who has lost her memories. She joins the Black Cat Cafe and, along with the other Automata, tries to understand her place in the world.
As Haizakura and her companions work together, they support each other in their individual searches for purpose, using Haizakura's singing and their collective experiences to navigate this new, peaceful era. Their journey is about overcoming the weight of the past and embracing an uncertain future.