Karneval

Karneval (カーニヴァル, Kānivaru) is a Japanese manga series by Tōya Mikanagi which originally started serialization in the monthly Josei Manga magazine Monthly Comic Zero Sum published by Ichijinsha on August 28, 2007. There are currently twenty volumes released in Japan. Yen Press has licensed the manga for release in English.

A 13-episode anime adaptation by Manglobe aired between April and June of 2013.

Plot
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 they 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"!!