What it has is Rally Vincent and Minnie-May causing havoc in Chicago in their Mustang GT500 via their trusty guns and bombs.
Watching this OVA after reading the manga is preferable as if you dig the manga then watching it animated after 9 volumes of guncrazy magic, is nice. Another reason is that 9 volumes doesn't translate into 3 episodes, so you're only getting a small percentage of the glorious fun that is Gunsmith Cats.
The OVA feels like its set either during or after the manga and doesn’t bother following anything in the source material or setting up character relationships. It just jumps right into the lives of Rally and Minnie-May, so casual viewers will either fall on board or check out swiftly, and manga readers will begin enjoying it immediately, just to keep Gunsmith Cats alive for a bit longer.
Unfortunately there is a noticeable lack of certain characters in the manga, such as Roy the friendly cop who is relegated to a cameo, Misty the thief who is absent, and there's a gaping black hole where Bean Bandit should be. Becky's way too nice and Minnie-May appears much younger here also, like a ten year old which makes her hijinks with bounty hunter Rally even more ludicrous, and with absolutely no hint of sexual deviancy that was so rampant in the manga.
So yeah, this is filler but like the manga it has an attention to detail with the city of Chicago as a backdrop and other miscellaneous aspects that at least keep the anime somewhat in reality, when every scene with Minnie-May threatens to blow it into fantasy. The OVA is also full of call-backs to the manga that uber fans will recognise and grin at (prosthetic guns anyone?) so the OVA is going to be an acquired taste.
The animation is pretty average but the design is good, cars, guns, gorgeous Rally herself, it’s all watchable so don’t let the year of release put you off. The music is nothing to shout about unfortunately, as is the direction, editing, writing, ok so other than the brand name this is just standard entertainment.
But then the OVA at least does something that the manga did excellently. That is to say: have an awesome car chase! A definite highlight of the OVA and one of the best in anime, with kinetic visuals, edge-of-your-seat thrills and all based in reality, with no physics-breaking stunts.
And finally the story. Oh yeah, story? Bunch of generic bad guys shooting and blowing crap up, what else? If you're going to watch this, watch it because you're a completist, and watch it for that car chase. They say cats have nine lives, well the gunsmith cats just lost one with this OVA; time to reload.
