After two thugs are killed, Dobu and his crew have three days to catch the murderers. Dobu suspects a hidden mastermind influencing the magistrate.

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.