Rally Vincent works by day in her Chicago gun store, Gunsmith Cats. But at the drop of the hat, she hangs up the "Gone Fishing" sign, straps on her guns and takes to the road in her muscle car to fulfil her other role - as one of Chicago's toughest, most respected bounty hunters. Her expert sharpshooting and driving skills are augmented by her partner Minnie-May's abilities with explosives of all kinds. And she'll need every bit of her skills, and those of her friends, because only she can bring in the highest bounties and the most determined, powerful criminals from Chicago's mob, characters who hold a grudge for life and have the wits and the firepower to outwit whatever the law throws at them.
Featuring some of the most authentically detailed firearms and automobiles ever drawn, author and artist Kenichi Sonoda has created a complex and supremely exciting story in the vein of hollywood action films, but with all the detail and dynamism of manga in this classic series.

From MangaUpdates:
Hoichi Kano, the Grandson of world famous inventor Hosuke Kano, is a student at Howa High School in Musashino City. At the tenth anniversary of the first contact with the Riofaldians, the unveiling of an Elevator Ship designed for orbital transport between the Riofaldian home world and Earth is about to take place. However, this was just a ploy to take control of the Earth using their advanced technology and large Riofaldian work force on Earth to their advantage. It is now up to Hoichi, with the help of Hosuke, his school friend Akane and Isaka, to stop them and save Earth.
There is plenty of mecha mega-robot action, state of the art gunsuits, sexy shape-shifting androids and the reason why the manga is called Cannon God...
But the Riofaldian are one step ahead and they have a plan...

Rally Vincent and Minnie-May Hopkins are two regular American girls. Regular American girls who own a gun shop, and might have dabbled in prostituion, respectively. And who happen to be a crack shot and an explosives expert, respectively.
These might be odd skills for American girls, but these two happen to be Chicago's top bounty hunters. Rally can shoot the trigger off a gun from a good distance, and May generally wreaks havoc with explosions and cuteness. And together, with some very useful friends and associates, they make up the Gunsmith Cats.
"Burst" finds our ladies back at work, back in action, and . . . back in trouble. ( by Darkhorse Comics)