In a fantasy world where firearms became the number 1 choice for mercenary monster hunters, One little girl hopes and dreams for a future and fate answers with the hard way.

Rue never had a life to begin with, a slum rat, poacher and thief but ever since she could remember she has wanted to be like the hunters and gunslingers that make up the hunters Union, wielding powers beyond human comprehension, Weapons shining and screaming in the heat of a battle against inhuman monsters and odds.
This is that story. cue the Shonen music.