The protagonist, Vietnam, gender: male, loves inventions and often tinkers with weird things. He lives in a car repair shop on the edge of the city. Vietnam's parents were eaten by monsters to protect 8-year-old Vietnam. It was his grandfather who pulled him up. There are many mutated monsters in the world today, cannibalizing humans, and monsters of different levels have different abilities. The more humans the monsters cannibalize, the stronger their power. Higher-level monsters can use monsters lower than themselves. They are very good at camouflage and have strong regeneration capabilities. Ordinary biochemical weapons cannot kill them, but they are afraid of light, so they only emerge after dusk. Monsters carry viruses on their skin and can infect plants. Human beings built Cloud City to isolate themselves from the monsters on the ground. Every once in a while, humans would use spaceships to come to the ground to fight with the monsters and rescue the humans imprisoned by the monsters. Human beings are strictly prohibited from going out privately. They must obtain a higher-level pass. Humans who go to the ground privately will be abandoned directly to prevent mutants from pretending to come to the Sky City to find things that should not be discovered. People with good physical fitness will obtain their own spirits as adults. Spirits can only choose one master. Of course, spirits are also divided into levels. The highest level spirit is Remy. The level of the spirit is determined by the talent of the owner. However, a small number of spirits have existed for a long time, and no one knows where they come from. The physical spirit can allow the person who signed the contract to obtain powerful weapons and abilities. The physical spirit has no entity. Only the person who signed the contract can see the physical spirit. You cannot see the physical spirit before signing the contract. Vietnam wants to develop its own weapons and go to the ground to find the mutant species that killed its parents and take revenge.
Purpose: I hope everyone can make close friends and gain happiness as they grow up