Roulette Otovic, an acid cloud cleaner at Aeropoli in Moskova, has always been confident in her ability to ride the wind on her trusty 'Hurricane' Skybike. But an accident sends him on a thrilling adventure...

Ray is a kid who doesn't like Xenopets, genetically modified animals that can be kept and used in the Xenopet battle arena. One day Ray finds Marie, a tiger Xenopet who was abandoned by her owner. Since then...