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A cosmic star field called "Underworld", an interstellar fleet called "Sky". A military school dropout forced by life, a mysterious heroic spirit who has never been serious. The transition of imperial power is accompanied by the conflict of civilizations, and unknown dark forces are lurking in the darkness and ready to move. The collision of blood and fire, the blending of love and justice, the choice of life and death-- When everything was settled, a certain marshal complained in an interview: "As a serious prospecting pilot, I have been helplessly neglecting my job all these years!"