New Chireiden was a nation that covers the whole of Mars. It was established in Year 5300 following the relocation of the Underworld that was previously under Gensokyo to Mars. However the nation didn't cover the whole planet until Year 7500, following the Unification of the Japanese colonies throughout the planet. In Year Seven Billion, the nation relocated to Neo Gensokyo in the Sunflower Galaxy due to fears of the ever expanding Sun. The planet was later annexed by the Empire of the Outer Planets in Year Eight Billion after its survival.