At the end of the Second Expansion Epoch, the galaxy was full of relics left by extinct civilizations, and human society was divided into different forces for mining, research, storage, and monopoly because of these legacies. Lin Shen, a front-line undertaker of the alliance's unpopular organization "Remains Collection Agency", was sent to sort out, seal and compare the seven ruins of the "Ashes Corridor" before Kuroshio Resources Company did in three months. He recorded last words, sorted out relics, and held unwitnessed farewell ceremonies for the dying civilization. On each dead planet, he gradually discovered that civilizations of various races, different forms, and different technological routes had all left the same star map mark deep in the ruins. Lin Shen invited Tao Zhibai, who was good at repairing damaged interfaces, and Ruan Shiyu, who had the ability to identify memories, to help them fight for control of the ruins with Gu Rinchuan, the leader of the Kuroshio, while piecing together the events behind the "Silent Sieve".
