Girls, guns, and grenades! Meet Rally Vincent and Minnie May. By day, they work at the Chicago gun shop that they own. By night (or holidays or week-ends), they moonlight as a pair of bounty hunters called the Gunsmith Cats. Rally is an expert at firearms, being able to judge the condition of a gun with a glance, and being an expert marksman. Minnie May is younger and less disciplined; and has an absolute fascination with explosives. Lots of explosives. Especially big ones. Together, they form an unbeatable team; much to the consternation of the local ATF bureau. Set in the city of Chicago, this action-adventure series features a lot of gunfights, car chases, and general mayhem.

Included in the final volume of the Revised Edition is SONODA Kenichi's four-chapter manga "Riding Bean", which was previously only serialized in Monthly Comic Noizy between December 1988 and October 1989. It was cancelled when the magazine ceased publication, and ended up never getting it's own volume.