The Duchy of Ossulu is a colossal, efficient nation, ruled by Jr Cadet Seria with an iron fist, and remarkable for its ubiquitous missile silos, suspicion of poets, and complete absence of social welfare. The hard-nosed, hard-working, cynical, humorless, devout population of 7.57 billion Ossuluans are kept under strict control by the oppressive government, which measures its success by the nation's GDP and refers to individual citizens as "human resources."

The medium-sized, corrupt, moralistic, well-organized government prioritizes Defense, although Industry, Law & Order, and Education are also considered important, while International Aid and Welfare are ignored. It meets to discuss matters of state in the capital city of Risqué. Citizens pay a flat income tax of 69.2%.

The frighteningly efficient Ossuluan economy, worth a remarkable 1,696 trillion Silvens a year, is fairly diversified and mostly comprised of black market activity, especially in Arms Manufacturing, Information Technology, Gambling, and Retail. State-owned companies are reasonably common. Average income is an amazing 224,051 Silvens, but there is a large disparity between incomes, with the richest 10% of citizens earning 940,733 per year while the poor average 34,679, a ratio of 27.1 to 1.

Long-wed spouses often regret proposals they made when they were twenty, the nation refuses to provide international aid, smiling in public is seen as criminally suspicious behaviour, and debates on whether toilet seats should be left up or down are increasingly commonplace. Crime, especially youth-related, is relatively low, thanks to a capable police force and progressive social policies in education and welfare. Ossulu's national animal is the AT Strapped Hound, which is also the nation's favorite main course.

Ossulu is ranked 279,320^th in the world and 121^st in Eientei Gensokyo for Safest, scoring 6.76 on the Bubble-Rapp Safety Rating.