The year is 20XX. Under a Maintenance of Public Order Act, carrying firearms has been permitted to a restricted few.
Tokyo has been converted, including major districts such as Shinjuku, Shibuya, Roppongi and Akihabara. Everyone now suffers a life of oppression and the threat of violence.
A mutual opposition in the underground plans to rebel against this malevolent syndicate. However, the people, and their names, as well as their occupations remain unknown.
The main female characters are Jou, Meg, Sei and Amy. These energetic and courageous teenagers with skills of professionals will deal with anyone who stands in their way — the gunfighter's way.