Ogami Itto, whose wife and his family have been killed by the Ninja Yagyu Family, vowed to avenge his family's death with his only son Daigoro. He becomes a professional assassin and continue searching Yagyu Family with Daigoro carried ln a wooden stroller. This wooden stroller is equipped some useful weapons such as rifles and spears. Not only lifeand-death struggle scenes but also Itto and his lovely sons'strong ties(heart-warming story) attracted audience when they were on the air. Many Ninjas are shown on every story. It also has much violence and erotic scene.