Parents campaign to change the law for families who have suffered from violent crime, after their son is murdered.

In the Sengoku era. The commander-in-chief of the Miwa troop, Masanori Miwa (Shohei Miwa) surrounded Kamuro castle and repeated attacking it. Finally, the castle fell. On the next day, there was a soldier of Kamuro, Son (Kiyotaka Nanbara) in the Miwa troop. Feeling angry with being told to join the war, he tried to run away but got caught by the Miwa troop. On the other hand, there was not the head of Shichiemon Kamuro, the lord of the castle, which is essential to show their win. Then, the head was sent.

Oniwaban is an organization that is composed of two ninja groups… Iga and Koga. This is a story of a secret spy who settled in Okazaki Joka town during the Seitoku period of General Ietsugu and his son who trained to be a Ninja.