在这部黑色嘉年华剧情/动画片中,本作属于架空幻想西欧都市，且充满了冒险及童话色彩的奇妙空想物语，故事围绕着手镯与羁绊而展开，主要讲述了主人公无（ナイ）以一个遗留在血泊中的手镯作为线索踏上寻人的旅途，途中被叫美弥的女人抓了起来，期间被进入房屋盗窃的花砾所救，并得知自己手上的手镯是国家防卫机关“轮”的识别证。之后两人便踏上了旅途，在此过程中接触到了国家防卫最高机关『轮』，并结识了与仪等人。
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".
如果其他方面也像人设这么给力就好了。狂欢节KARNEVAL。没标题就花砾。我真是无药可救的肤浅啊。
