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.