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In a future world where humans have set foot on the stars and are highly dependent on cutting-edge mechas ("star armors") for development, war, and competition, a strange creature called the "Origin Beast" was discovered and gradually integrated into human civilization. The source beast has unique biological energy ("source energy") that can resonate with the core of a specific model of star armor, giving the mecha beyond conventional increases, special abilities and even morphological changes. Warriors who drive star armor and contract with source beasts are called "beast armor pilots".