I Am Making Cards in Another World

Era background: A different world with a level of civilization similar to that of the early days of the second industrial revolution. There are trains and telegraphs, but the core energy source is not coal and electricity - it is "pulse". Geographic environment: Federal Continent, surrounded by sea. The central part consists of plain urban agglomerations, mountain mining areas in the north, dense forest wetlands in the south, and desert rift valleys in the west. The entrances to secret realms are scattered all over the place. Social Structure: Federalism. The federal parliament is in charge of administration, the four major colleges are in charge of card training, and each city-state is autonomous. 85% Of civilians are "card holders" - using civilian cards to get by without fighting.