Dark Arms features a girl, Meghan Loughlin, whose job is to defeat and contain an outbreak of demons and act as a mediator between this world and the next.
The player can collect the spirits of the various demons and zombies they fight in the game with a gun known as “The Catcher”.
The player-character can then use captured spirits to ‘feed' their weapons and evolve them into more powerful forms. For example, the Handgun evolves into the Sub Shotgun, which can evolve further into the Shotgun.