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On the planet Ios, which has a gravity ten times that of the Earth, Moroso has been a "lonely person" for thirty years-everyday he fights with the round, poisonous AI Iron Egg, moves giant rocks to practice, and watches fluorescent vegetation wither and flourish. His only companion is a flying beetle. Until he pried open the encryption cabin left by his parents, half a metal token and a blurry holographic image tightly bound his life experience to the earth that had long been reduced to a wasteland. Landing on the earth in a pieced-together old spacecraft, Moroso was dumbfounded: the blue sky and white clouds in the book turned into a gray dome, and humans had to pay to even breathe. Fortunately, the ten times gravity was not in vain - he could overturn an armored vehicle with one hand, resist bullets with his body, plus the alien technology unlocked by Iron Egg. "The strength of the people on Earth is weaker than the slugs on Ios." Moroso complained, shaking his fist. He wanted to find out the truth about his parents' sacrifice, but he ran into Su Rui, a purification scientist who was being hunted, and witnessed the massacre of civilians in the settlement. When Tiedan analyzed that the token contained the key to the rebirth of the earth, and when the leader of the Black Cage, Ghost Hand, came to the door with a mechanical armor, Moroso was completely angry. This is a heart-warming story about an alien orphan who uses brute force and technology to overturn the order of the wasteland and restart the life of the earth. Accompanied by a vicious AI, its combat power crushes the whole process. Conspiracy and warmth coexist, and the ending points directly to the new interstellar era of symbiosis between two planets!