Originally published in France, OKKO is the story of a ronin warrior and his band of demon hunters as they travel from village to village during the age of the fictitious Pajan Empire (similar to medieval Japan). When two of Pajan's great clans covertly agree to a marriage between their heirs to form a powerful alliance, Okko the ronin and his group of demon hunters are recruited to insure the security of the ceremony in the long-awaited fourth volume of the series that blends the fantasy and samurai genres.