The story takes place in a super future where neither time nor place can be determined. The world is composed of highly developed networks (software) and super structures (hardware) as the carrier of its reality. Humans, who should have benefited from the prosperity of science and technology, lost their qualifications and abilities to connect to the network (equivalent to citizenship) due to a disaster. Without a ruler, AI began to exclude humans who lost their qualifications to connect to the network according to management regulations. People who have forgotten their former prosperity can only live in the shadow of the management system. The stage of this work is set in such a world where humans are gradually declining. The world with the urban structure as the stage is like a huge high-rise building or a huge city connecting all buildings. Most of it is covered by the super structure, forming a ladder structure. Due to the loss of control by the builders, the urban structure is expanding endlessly, and at least it has reached the orbital plane of Jupiter at the time of the story of this work. According to the description of the ruling bureau, it is this aimless growth of the city that fundamentally caused the chaos that affected the whole world. The result is undoubtedly a very low population density. The environment, as far as the urban structure is concerned, is sterile due to the nanorobots scattered throughout, ensuring the elimination of biological viruses. This achievement was achieved by the instructions given to the ruling bureau by the network ball when it was functioning normally. In principle, the infectious diseases caused by strong viruses in the main works of "BIOMEGA" and "DEADHEADS" by the same author are impossible to occur in this work. From these settings, it can be inferred that the "infection" as the cause of the mutation of the network terminal genetic factor is not the same as its literal infection, and it is very likely caused by the difference in system logic. Story outline Explorer Wu Hai wanders in a huge, boundless staircase city with thousands of layers. Holding a graviton radiation emission device that can penetrate all matter, he pursues the network terminal genetic factor.