The "Mecha Queen" from three hundred years ago, Shen Zhaoyun, wakes up once again, unexpectedly turning out to be a student with rock-bottom physical fitness and dirt-poor finances who shares the exact same name. To earn money to build mechas and to investigate the truth behind the death of an old friend, she joins the down-and-out X Flame Club, retrofitting obsolete scrap mechas into the "Immortal Dawn". All the way through repairing mechas, fighting in ring matches, and defeating powerful adversaries, she overturns the monopolized technological high wall. No one knows that this "good-for-nothing" right before their eyes is precisely the mecha progenitor from the textbooks.