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Introduction: In 2023 AD, the Black Demon, the leader of the Demon Star from the extragalactic galaxy, also fought against Ares, the guardian planet of the Milky Way, to seize the Milky Way. Pier, the former king of the Milky Way, defected to the Demon Star out of greed and told the Demon World that they could quickly seize the Milky Way by snatching energy crystals. The energy crystals of more than half of the planets in the Milky Way have been brought to Earth by Lufa. The Earth is also the best place to obtain more than half of the energy crystals. The battlefield has since moved to Earth...