The story follows the journey of a boy called Nai who is looking for someone called Karoku with only a bracelet as a clue. Through a series of unfortunate events he winds up partnered with a thief called Gareki and they learn that the bracelet is actually an ID from the defense organization called "Circus."

Credits include:

Director: Eiji Suganuma (Sasameki Koto, Kodomo no Jikan)
Scenario : Tôko Machida (Saiyûki Gunlock, Saiyûki Reload)
Character Director : Toshie Kawamura (Smile Precure!)

Music: Shiro Hamaguchi, Keiji Iuchi 
Studio : Manglobe (Samurai Champloo, Hayate the Combat Butler: Can't Take My Eyes Of You)

The open will be "Henai no Rondo" by GRANRODEO, with "Reason" by KAmiYU as the ending 

with cast:

Nai - Hiro Shimono  (The World Only God Knows' Keima Katsuragi) 

Gareki - Hiroshi Kamiya (Durarara!'s Izaya Orihara)

Yogi - Mamoru Miyano (Hunter x Hunter's Chrollo Lucilfer)

Tsukumo - Aya Endo (Kids on the Slope's Yurika Fukahori)

Hirato - Daisuke Ono (Black Butler's Sebastian Michaelis, Saizō Kirigakure from Brave 10)

Jiki - Yūichi Nakamura (Gray Fullbuster from Fairy Tail, Sōshi Miketsukami from Inu x Boku SS).

Tsukitachi - Koji Yusa (Yoru no Ou from Kore wa Zombie Desu Ka?, Lunatic from Tiger & Bunny)

Akari - Daisuke Hirakawa (Hyakka Ryouran Samurai Girls' Yagyuu Muneakira)

Iva - Youko Honna (Pretty Cure's Cure Black)

Kiichi - Eri Kitamura (Bakemonogatari' Karen Araragi)

Htisuji

Nyanpersona

Usagi