Many years ago, a Great Civil War ravaged Japan, leaving the country fragmented between two regions: Kansai and Kanto. In Kansai, a group of six Akudama carry out missions given to them by a mysterious black cat, while evading the police. But a dangerous journey is about to unfold when a civilian girl becomes twisted into the Akudama’s way of life and witnesses their criminal drives. 
 
(Source: Funimation)
 
Note: On May 28, 2021, a director's cut of the final episode was released which included approximately 5 minutes of new content.

Long ago, the "Kantou" and "Kansei" countries had a war that divided the world. But at the end of the war, Kansei became a vassal to Kantou. However, Kansei's government and police force declined, and crime became rampant. The criminals are called "Akudama." 
 
(Source: Anime News Network)

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