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This is blue! Planet CD0623! 20 Light years away from the human home planet! When the surviving escape fleet landed on Azure for the first time, the planetary environment was surprisingly similar to its home planet, which made humans once think that they had found a new home. However, the first Overlord landed on the Eastern Continent and destroyed the city that humans had spent nearly twenty years building in just one day! Facts have proved that the blue sky is not a paradise for human reproduction! In order to survive, humans created their own overlords - mechas, and established a defense line of steel and iron to protect their new home! Time has come to Azure 69, and a full 40 years have passed since the first Overlord landed. As mecha technology becomes increasingly mature, humans begin to achieve more and more victories. The living space has been expanded, the population base has increased rapidly, and society is developing in a good direction! When the settlement has been peaceful for too long, and more and more people gradually forget the fear of being dominated by the overlord, the secrets of this planet have only just been revealed! Humans have never truly conquered this planet!

Three romances in the underworld.