Above the ocean sky floats an enormous tree. From it fall golden crystals called Mitra—and whether a Mitra crystal brings unlimited fortune or unbearable suffering is entirely a matter of where it lands and who receives it. The world Mitrasphere depicts is carrying several simultaneous disasters: a village whose people are petrifying and slowly becoming trees, a girl enslaved whose speech no one can understand, a warrior who lost both his country and a limb, and a group of travelers from elsewhere whose fate is already scripted toward doom. When enough of them decide that fate can be resisted, a compass shows the way.