The Princessdom of Sailor Mercury is a gargantuan, efficient nation, ruled by Princess Sailor Mercury with a fair hand, and notable for its museums and concert halls, keen interest in outer space, and sprawling nuclear power plants. The compassionate, hard-working, democratic, cheerful population of 17.624 billion Mercurians hold their civil and political rights very dear, although the wealthy and those in business tend to be viewed with suspicion.

The medium-sized, liberal government prioritizes Education, although Industry, Healthcare, and Environment are also considered important, while Spirituality and Defense are ignored. It meets to discuss matters of state in the capital city of Caloris. The average income tax rate is 41.5%, but much higher for the wealthy.

The all-consuming Mercurian economy, worth a remarkable 1,956 trillion Mercurites a year, is led by the Book Publishing industry, with significant contributions from Tourism, Information Technology, and Retail. Average income is an impressive 111,020 Mercurites, and evenly distributed, with the richest citizens earning only 2.1 times as much as the poorest.

Police officers often head to work wearing onesies and fluffy pink bunny-slippers, it is mandatory to learn evolution in schools, common misteaks slip threw as the Issues Editing Team adds issues by the hundread (Sailor Mercury has found 2 easter eggs), and cats have more rights than the average citizen. Crime is totally unknown. Sailor Mercury's national animal is the cat, which frolics freely in the nation's many lush forests, and its national religion is Mercurism.

Sailor Mercury is ranked 24,063^rd in the world and 12^th in Osakaland for Most Scientifically Advanced, scoring 251.85 on the Kurzweil Singularity Index.