Bounty hunters A-ko and B-ko rescue their friend C-Ko from space pirate Gail's scheme to use her as a host for the undead sorceress Xena, who aims to merge all parallel universes. They traverse various eras and realms to stop the merger.

An original video animation (OVA) featuring alternate-reality versions or the main characters of the "Project A-ko" series. A-ko and B-ko are female bounty hunters, working together as partners instead of rivals (as in the original series). When the space pirate Gail kidnaps their wealthy acquaintance C-Ko, the girls launch a rescue mission in order to claim the reward money. They learn that Gail wants to use C-Ko as the host body for the spirit of the long-dead sorceress Xena who will purify" the universe for him. The undead sorceress instead attempts to merge all existing parallel universes into one. A-ko and B-ko find themselves in a variety of different eras and locations, while trying to prevent the merger.—Dimos I