Matagoro Yoshimura, a samurai in feudal Japan, eschews traditional combat prowess but masters seduction and sexual techniques. Tasked with retrieving fragments of a treasure map inked onto female ninjas—revealed solely during climax—he relies on physical endurance, charisma, and anatomical gifts to offset his lack of swordsmanship. His quest intertwines with a personal mission: finding his adopted sister, Sayo, kidnapped by enemies years earlier. This dual purpose fuels his feudal lord’s assignment, merging duty with familial resolve. As his journey progresses, encounters with adversaries evolve from lethal outcomes to measured mercy, as seen when he spares the kunoichi Hanakage.

Matagoro’s fiery red hair and remarkable stamina prove vital to his pursuits. The treasure he seeks emerges as women preserved in suspended animation, forming a living harem, though their broader role remains undefined. His bond with Sayo carries romantic undertones, framed by the "Not Blood Siblings" trope, yet their relationship’s depth stays unexplored.

Exclusive to the original OVA series, Matagoro’s story remains confined to this narrative. He is consistently portrayed as a comedic yet resolute figure overcoming obstacles through unorthodox methods, balancing humor with tenacity in his unconventional path.