From Right Stuf! In the year Correct Century 2345, Earth's population is limited to simple, steam-driven technology after past cataclysms while the Moon is populated by the Moonrace, humans who left Earth after a great war long ago to reside in technologically advanced lunar colonies until such time as they deemed the Earth suitable to reclaim. Loran Cehack, a young member of the Moonrace selected as part of a mission to determine whether or not the Earth was fit for resettlement, spends one year living on Earth  and grows attached to its people. With the expectation of a peaceful resettlement operation from his people, he and a pair of his close friends sent down with him confirm that the Earth is now fit for the Moonrace to make their return. He's taken by surprise when the Moonrace intends to return to Earth via an offensive with mobile suits, and their first attack sparks a violent conflict between Earth and the Moon.
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