Tochiro emerges as a key figure in the "Cosmo Warrior Zero Gaiden" specials, concealing advanced technology capable of opening a dimensional gateway on a remote planet—a pinnacle achievement in his engineering pursuits. He actively defends this gateway against rival pirate factions, showcasing technical expertise and steadfast commitment to protecting critical secrets. During the conflict, he coordinates with Captain Harlock to safeguard the gateway, demonstrating their established partnership and shared dedication to preventing advanced technological discoveries from falling into hostile hands. The specials depict him as a brilliant engineer responsible for groundbreaking technological innovations.