[Unknown mechanical industry world vs. A gorgeous journey to save the world! The curtain of the 4D giant-screen science fiction blockbuster on children's paper begins! The annual children's adventure science fiction novel is waiting for you to read! Absolutely obedient robots, indestructible mechanical city fortresses, and mechanized ecosystems that can only be adjusted. There is no pressure from study, no pressure from work, and no worries from life. This is a perfect and sincere building, the highest level of human life. When the development of science and technology in human society reaches its peak, the era of mechanization of all industries begins. Absolutely obedient robots and impregnable city fortresses. Human beings live in a cold mechanical city and gradually lose the qualities that a human being should have. This is a story about love, partnership, ideals and growth. It is a story that can bring people courage and hope.