The Empire of Koganei is a gargantuan, orderly nation, ruled by Uzuki Shimamura and Callie with an iron fist, and remarkable for its zero percent divorce rate, smutty television, and ubiquitous missile silos. The hard-nosed, cynical, humorless, devout population of 26.232 billion Koganeians are ruled with an iron fist by the dictatorship government, which ensures that no-one outside the party gets too rich. In their personal lives, however, citizens are relatively unoppressed; it remains to be seen whether this is because the government genuinely cares about its people, or if it hasn't gotten around to stamping out civil rights yet.

The large, corrupt, well-organized government prioritizes Defense, with Industry, Law & Order, and Education also on the agenda, while International Aid isn't funded at all. It meets to discuss matters of state in the capital city of Chōshi. The income tax rate is 100%.

The frighteningly efficient Koganeian economy, worth an astonishing 16,431 trillion Yen a year, is broadly diversified and mostly comprised of black market activity, especially in Information Technology, Arms Manufacturing, Retail, and Beef-Based Agriculture. State-owned companies are reasonably common. Average income is a breathtaking 626,372 Yen, and distributed extremely evenly, with little difference between the richest and poorest citizens.

Movies depict muscle-bound women kicking down a titanium door to carry hysterical men to safety, the practice of capital punishment proves divisive, the government spends millions of Yen every year prosecuting spammers, and being able to unblock a u-bend pipe is considered a universally essential skill. Crime, especially youth-related, is totally unknown, thanks to a well-funded police force and progressive social policies in education and welfare. Koganei's national animal is the Raven, which is also the nation's favorite main course.

Koganei is ranked 326,335^th in the world and 24^th in Gensokyo for Safest, scoring 4.63 on the Bubble-Rapp Safety Rating.