Fūsuke, one of three Ninku warriors, travels to a port town with companions Aicho and Touji to find Makoto, the younger sister of a deceased wartime comrade. This fallen ally entrusted them with delivering an inherited knife to Makoto before his death. Upon arrival, they encounter pirates led by Rasen Ryuu attacking the townspeople. Fūsuke, Aicho, Touji, and Makoto unite to confront the pirates and defend the town. His actions during this conflict reflect his dedication to honoring promises made to fallen comrades and safeguarding innocent lives. These events occur in a single special episode set prior to the main television series.