It only appears alongside Teana at the beginning of StrikerS and the early chapters in StrikerS manga. It is later replaced by Cross Mirage. Teana was fond of gun-shooting games since she was a child. Hence even before her enlistment as an Administrative Bureau cadet, she was interested in making a gun-shaped Device with cartridge system, which resulted in the creation of Anchor Gun. It also led to her being assigned in the training school as a partner of Subaru Nakajima (who similarly created her own Device), due to their different magic styles from other cadets.