One of the original eight members of the Armament. Kengo with Ozawa Shinkichi, joined the Front after seeing their fellow Suzuran freshman and friend Ooshima Eizou constantly jumped by upperclassman.

After the first year of the Armaments reign, the Front went to war with Back-Teria. Back-Teria head Yamagami had Miyagi's close friend Shinkichi jumped. The search for Yamagami was on. Kengo interrogated grunt level Back-Teria members in search for info on their leader.

He is currently living an honest life somewhere in Japan.