"Gunsmith Cats" is a three-episode OVA series based on the manga by Kenichi Sonoda. Set in Chicago, the story centers on Rally Vincent, a skilled gunsmith and bounty hunter, and her partner, Minnie May Hopkins, an explosives expert. Together, they run a small gun shop while taking on dangerous jobs to capture criminals and solve cases. Their expertise in firearms and combat makes them a formidable duo in the city's underworld.

The narrative begins with Rally and Minnie May being hired by a local detective to track down a missing girl. Their investigation leads them into a web of corruption involving human trafficking and illegal arms deals. As they delve deeper, they encounter Bill Collins, a rogue ATF agent with a personal vendetta against Rally. Collins manipulates events to frame Rally for a crime she didn’t commit, forcing her to clear her name while protecting innocent lives.

Throughout the series, the dynamic between Rally and Minnie May is highlighted, showcasing their contrasting personalities and complementary skills. Rally is calm, methodical, and highly skilled with firearms, while Minnie May is energetic, impulsive, and adept with explosives. Their partnership is tested as they face increasingly dangerous situations, including high-speed chases, shootouts, and confrontations with organized crime.

The plot is driven by action-packed sequences and a focus on the protagonists' resourcefulness and determination. The series balances its gritty tone with moments of humor and camaraderie, particularly in the interactions between Rally and Minnie May. The setting of Chicago is utilized effectively, with urban landscapes and noir-inspired elements adding to the atmosphere.

"Gunsmith Cats" is notable for its attention to detail in depicting firearms and tactical scenarios, reflecting the creator's passion for the subject. The series appeals to fans of action and crime dramas, offering a concise yet engaging story with strong character dynamics and a focus on realism in its portrayal of weapons and combat.