Ryō Kamijō serves as the Gunnery Officer aboard the resurrected Space Battleship Yamato. He operates the vessel's primary and secondary weapons systems, including the powerful Wave-Motion Gun. During a critical battle defending the Third Emigration Fleet against hostile forces, the Yamato sustained heavy damage. Intensely frustrated, Kamijō stood poised to unleash the Wave-Motion Gun. Captain Susumu Kodai physically restrained him, explaining the devastating consequence: firing the weapon would drain the ship's energy reserves completely, leaving it defenseless. Kamijō complied with the order and powered down the weapon system.