The Phantom Galen Cannon Is Going to Blow!!

Synopsis

Baron Ashura tries to revive a decisive weapon developed by the former Imperial Japanese Army and install it in a front-line base under construction. These are the giant Galen Cannon, intended for the mainland decisive battle but never realized, and powerful Magdam gunpowder. Sensing suspicious activity, Koji boards Mazinger Z and heads to the site, guided by Sayaka, who escaped the Iron Mask Army. Baron Ashura retaliates by deploying the Mechanical Beast Brighton J2. After learning of the Galen Cannon's existence through reconnaissance, Koji and his allies devise a plan to destroy it.