The year is 2068. The place, Fontainebleau forest, ancient home of some of France's mightiest monarchs on the outskirts of what was once Paris. The post-apocalyptic society of Pan survives by growing rice and scavenging among the ruins of a destroyed civilization. Their precarious existence comes under threat when the powerful, technologically advanced Federation of Fortuna forces them into a dangerous choice—submit to Fortuna's rule, or try to best them in a barbaric, ritualized game known as Celestial Mechanics. Pan's only hope? A hot-headed outcast they'd rejected for being "un-Pan": a girl named Aster.

Glorim Cortis is a military celebrity in the Imperial army. The Empire has conquered many known lands, but not yet any unknown. This is the mission entrusted by the emperor to Glorim and his squadron. Once they cross the final frontier of mapped Imperial territories, this group of elites rides their way through a series of intense emotions spanning from doubt to fear. One thing is for sure: as the new map’s outlines slowly take shape, their expedition will lead to things that none of them were expecting…