Born into the esteemed Nishizumi family, she initially enrolled at Ooarai Girls Academy to escape from Sensha-dou. However, she was coerced by the student council into joining Sensha-dou despite her initial reluctance. She is currently a second year and places great importance on considering her friends' feelings above all else. Her past experiences with tanks have left her with traumatic memories that still haunt her. As the commander of Ankou team, she serves as Ooarai's de facto captain.