> When the "Void Beast" from another dimension tears apart the sky, the fate of mankind is handed over to the hands of a girl-shaped weapon called "Maiden".
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> Each "Machine Girl" is equipped with a unique "Core Matrix", which is both the source of their power and the place of their soul. To activate this power, you must rely on a male pilot named "Key-Holder" to complete a high-risk "soul fusion" in the machine girl's "Sanctum".
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> This "fit" is sacred and unique. Once the "Matrix" and the "Key One"
