One day, a certain city released a video from several decades ago. Finally, humans understood why that explosion occurred, the one that changed all of humanity.,This video is questionable because it's been processed, and as a result, all sorts of conspiracy theories have sprung up. Humans need a reason to vent, and even though this apocalyptic reason seems somewhat silly, it provides that outlet.,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.。