People Living in a City That Blends Different Worlds

In the twenty-fifth century, an individual who lived from the distant past to the present chose to create a city in the center of the world. This city is huge and majestic, existing in the sky, underground, and submerged in the sea. Races from different time and space, different places, and different worlds live in the city. The city is also composed of urban parts in different time and space and different locations. In this city, wireless possibilities exist, steam machines, magic, witchcraft, swordsmanship, and technology are integrated together. Basic disciplines from different worlds: mathematics, logic, astronomy, astrophysics, earth science, space science, physics, chemistry, and life sciences are intertwined and developed. Countless mysterious energies and indescribable gods are projected here. From here on, great civilizations collide with each other!