In Trapt, the player takes on the role of Princess Allura, horrified by the sudden murder of her father the King of Fronenburg and worse, being framed for his murder by step mother - Queen Catalina, later forced unwillingly to flee the castle with her maid Rachel.

Fleeing her pursuers, she takes refuge in a forbidden castle, known through rumors as the place where an evil being only known as 'the Fiend' was imprisoned. It was not by coincidence she was led here, as it turns out she was chosen by the Fiend to become her servant and wielder of the evil power the Fiend possesses. This power transforms the once-innocent princess into a brutal Trapmaster capable of summoning and activating traps at will to the unwary enemy.