Kaitou Queen wa Circus ga Osuki

In a world filled with airships, the Kaitou Queen is someone who never fails to steal what they are after. Their age and gender is unknown. However, a mysterious circus troupe appears, with magicians hypnotists, and those with other special powers in its ranks. The circus troupe manages to steal the gem that Kaitou Queen is after, and challenges Kaitou Queen to a contest. (Source: Anime News Network)