Eita Nadaka is the Main Operator aboard the Shirogane under Captain Daitetsu Minase's command, responsible for critical operational duties. After events in Antarctica, he transfers to the new battleship Hagane, continuing in his role as Main Operator. His responsibilities encompass multiple significant areas, forming a multifunctional position essential to ship operations. Nadaka consistently performs effectively, maintaining reliability even in high-pressure or dangerous situations. Captain Minase entrusts him fully due to his proven competence. The Hagane's crew, including its operators, maintains heightened vigilance during security-sensitive scenarios, such as thoroughly analyzing potential threats when individuals are recovered under unusual circumstances, reflecting the operational environment where Nadaka serves.