Rei, a lone Voidrunner, races against time to prevent her world from being consumed by the Ultravoid, a catastrophic black hole that threatens to obliterate everything she knows. Her journey takes her into a haunting, luminescent pocket of space where reality bends into surreal terrain, and she glides across shifting landscapes inhabited by enormous creatures known as the Remnants. To buy her planet precious time, Rei must confront these colossal beings in combat while piecing together the truth behind the Ultravoid's nature and uncovering what desperate circumstances drove her to undertake this seemingly impossible mission.