When bounty hunter Jenosa Arma takes on a mission to investigate Planet Inos, a research center investigating an alien lifeform called Scurge: Hive , she gets more than she bargained for. While in orbit around the planet, she is attacked and quickly infected with the Scurge herself. Jenosa has no alternative but to land onto Inos, to investigate the Scurge and find a cure.
Jenosa can earn experience as she blasts infected life forms; this experience will upgrade her firepower and health. Better weaponry can be found, as well as gadgets which help Jenosa access new areas. Some weapons are twice as effective on particular opponents; inversely, they are ineffective against other enemy types. It's up to you to figure out the best weapon for the right situation.