The Kanto area and Kansai area are in secret tug of war. Descendants of ninja from Kansai harass Kanto area. One day, 4 female high school students from Tokyo transfer to a new school. They are descendants of ninja who are sent to protect Tokyo.
Follows the fluctuating fortunes of three ronin in feudal Japan who wander from castle to castle, selling their services to whichever lord will fill their rice bowls. Though they use the servants' entrance, they still feel themselves bound by the samurai code of Bushido; and this tension leads to tragedy.
Takeshi Hongo is a promising young man with a passion for motorcycle racing. However, his dreams are suddenly ruined when he gets kidnapped by Shocker, the evil secret organization planning to dominate the world. After being remodeled into a cyborg, Takeshi escapes and swears to protect the world from the inhuman monsters.
