Shiokaze Umino, a 16-year-old naval academy cadet, trains to wield "Virgin Energy"—a rare supernatural force powering advanced fighter jets that shield Japan from foreign threats. Born into post-World War II tensions marked by looming conflict with Russia, her turquoise hair and ochre eyes mirror her unconventional path. Driven by a vow to graduate before marrying her fiancé, she navigates the clash between youthful dreams and duty. Initially hesitant, she grows into her role as training intensifies, forging resilience amid escalating crises.

Her journey intertwines with classmates Satsuki and Komachi, the trio anchoring the Virgin Fleet unit. Together, they grapple with mastering their abilities while enduring adolescent trials. Pivotal shifts—from self-doubt to resolve—culminate as external dangers mount, compelling her to reconcile personal desires with her nation’s survival. Though her story centers on the original OVA series and a PlayStation sequel, her arc crystallizes a transformation: a tentative cadet rising as a linchpin in Japan’s defense, her choices etching the fragile balance between sacrifice and hope.