During the era of the samurai's reign in Japan, the Shinsengumi of Kyoto held the responsibility of maintaining public safety and order. However, the ruthless Masked Demons attacked the group, leaving only one survivor. This survivor, Ichibanboshi, takes on the role of Acting Commander Isami Kondo and gathers a group of former criminals to help him seek revenge against the Masked Demons for murdering his parents. Watch as this unconventional team works to restore peace and order in their own unique way. Prepare to witness their brilliance!