The titular masterless samurai and protagonist of the series, renowned for his signature 'Engetsu Sappo' (Full Moon Cut) technique. This fourth and final installment marks the conclusion of his cinematic arc, where he is drawn into a morally complex situation involving an artist's request and a mysterious wife who shares a deep connection to his past. Simultaneously, he faces political pressure from the Kurume Clan, testing his principles as he navigates his legacy, past entanglements, and the final chapter of his journey.