Three part anime adaptation of the manga developed by Kenichi Sonoda in response to the cancellation of his "Riding Bean" series (which also had a one shot anime feature of its own).
Rally Vincent (originally a character in "Riding Bean") is a bounty hunter and gun store owner who, along with her short statured bomb loving partner Minnie May Hopkins, hunt down criminals for the right price. Then an ATF agent by name of Bill Collins shows up and he has dirty information on them that he uses to blackmail them into helping him uncover a gun ring which connects to both his boss and a crooked politician and eventually involves a giant hulking Russian assassin the size of a basketball player.
Kind of like a bizarre mix of "Lethal Weapon", "Blues Brothers", "Die Hard", and other big explosion action features. It's bright and it's funny and it'll kill time on a slow night.