The Best Girl of Arimura Hinae is a colossal, genial nation, ruled by Arimura Hinae with a fair hand, and notable for its daily referendums, frequent executions, and punitive income tax rates. The compassionate, democratic, devout population of 7.715 billion Arimura Hinaeans are free to do what they want with their own bodies, and vote for whomever they like in elections; if they go into business, however, they are regulated to within an inch of their lives.

The large, liberal, socially-minded, outspoken government juggles the competing demands of Education, Healthcare, and Law & Order. It meets to discuss matters of state in the capital city of Happiness. The average income tax rate is 59.5%, and even higher for the wealthy.

The large but sluggish Arimura Hinaean economy, worth 215 trillion yen a year, is driven entirely by a combination of government and state-owned industry, with private enterprise illegal. The industrial sector, which is quite specialized, is dominated by the Trout Farming industry, with significant contributions from Arms Manufacturing, Tourism, and Information Technology. Average income is 27,953 yen, and distributed extremely evenly, with practically no difference between the richest and poorest citizens.

Skateparks can be found in every city, legitimate job descriptions now include "smiling and waving", builders across Arimura Hinae are blocked up with orders for new public loos, and the Arimura Hinae Enquirer offers weekly cash prizes for 'most blasphemous song, story, or cartoon'. Crime, especially youth-related, is totally unknown, thanks to a well-funded police force and progressive social policies in education and welfare. Arimura Hinae's national animal is the phoenix, which soars majestically through the nation's famously clear skies.

Arimura Hinae is ranked 167,064^th in the world and 2,232^nd in Ambition for Largest Insurance Industry, scoring 330.02 on the Risk Expulsion Effectiveness Rating.