Konjo is Rentaro's friend and rival, transforming into Kamen Rider Hattari. He is in love with Rentaro's sister Iroha as well. Konjo's willing to do anything to achieve his goals, leading him to butt heads with Rentaro in and out of their Rider forms. Konjo is also unaware of the fact that Rentaro and Shinobi are in fact the same person.

Despite all this, Konjo takes a hit meant for Rentaro, and is turned to the side of evil for this special.