By 2846, Earth is uninhabitable. The survivors moved into space and developed Terraforming Humanoids — robotic beings built to convert planets into places humans can live. Then aliens who needed the same planets began attacking the Humanoids and destroying their work. In response, humanity deployed Pentasma: a plasma-powered space jet armed with lasers, smart bombs, and tractor beams, tasked with defending the Terraforming Humanoids from alien assault. A vertical shoot-em-up.