As a result of years of war, the earth's environment was destroyed frequently, and human beings were forced to leave the earth and have been living in cities in huge spaceships for 500 years. The computer system that controls the cities deliberately conceals the truth in order to prevent humans from repeating the same mistakes. Let human beings live in the virtual society of the 20th century. The biker never cares about society or the world; he and his companions play and drive every day. Until one day, one of his old friends left him a mysterious super bike. The super bike named Grando used to hide a big secret. Using this motorcycle, Sango discovered that humans had been living in a huge spaceship, operated by a supercomputer system called Baham.
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