Nai searches for someone important to him, with only an abandoned bracelet as a clue. Gareki steals and pick-pockets to get by from day to day. The two meet in a strange mansion where they are set-up, and soon become wanted criminals by military security operatives. When Nai and Gareki find themselves desperate in a hopeless predicament, they encounter none other than the country's most powerful defense organization - "Circus"!!
An anime preview DVD for an anime adaptation bundled with the 10th limited-edition volume of Karneval manga.
J Michael Tatum, the US script writer as well as playing Captain Tsukitachi of Airship One, gives his personal views on the series – and encourages cosplayers to copy the colourful costumes.