In the far future, humans share their world with the feline race of the sphinx. D'Artagnan, a young loner, dreamer, and gadget master, lives a quiet life with his scientist uncle. Until the day he meets Rissa, an attractive girl sphinx of his age who's more than a match for his rebellious, smart-aleck ways. But even as the two grapple with feelings they've never experienced before, they stumble across a villainous plot to kidnap a genetically engineered racehorse! Can Rissa and D'Artagnan foil this evil plan? Come to think of it, can they pull it off without killing each other?