In the mid-21st century, an asteroid flew towards Earth. Humans observed the planet through a super telescope 20 years ago. Subsequently, they contacted the planet using extraterrestrial life exploration robots that had already been launched and discovered new substances. Driven by their thirst for knowledge and exploration, humans began preparations for landing. This planet, which will briefly brush past Earth, will stay outside Earth for thirteen days. Humans must seize this opportunity to discover new substances.,Nations reached a consensus, collaborating by providing each other with funding and technology. Gathering the world's top scientists, they finally succeeded in landing on this planet at the moment of planetary contact, and immediately announced the discovery of many diverse new materials.,Brilliant City, a city built within massive defensive walls. It is called Brilliant City because it was the first human city to utilize planetary unique materials to develop an artificial sun. It is a gigantic city with a population exceeding 30 million.。