Solar Ash takes place in a vast, varied, desolate world that exists within a black hole known as the Ultravoid. The Ultravoid is filled with different collectibles to find, including audio logs called Voidrunner caches left behind by a team of Voidrunner's intent on stopping the Ultravoid from destroying their planet. The main character, Rei, can find these caches to discover what happened to the rest of her team.