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Just read a summary of a Japanese novel that say:
A few hundred years into future, Japan have been completely controlled by the self-expanding Yokohama station, and brain of all human have already been implanted with Suika chip. A man who was sent into exile for trying to rebel against the station have obtained the 18 Kippu that can save the humanity. The future of humanity is now hang upon his 5-day 400-km journey within the Yokohama station.
