Mashiro Munetani is a main character in the anime series 'High School Fleet.' She serves as the executive officer (XO) of the Harekaze, supporting the captain and managing the ship's crew. Mashiro is known for her serious and responsible personality, often acting as a counterbalance to the more easygoing captain, Akeno Misaki. Her dedication and determination help keep the crew focused during crises, making her an indispensable member of the Harekaze's leadership.