Mau Sakisaka, Shiokaze Umino’s childhood companion and fiancé, navigates an engagement contingent on her graduation from the Nakano Naval Academy—a pact formalized by Shiokaze’s late parents, binding his personal ambitions to her military and academic obligations. His persistent efforts to escalate their romantic relationship collide with her duties as a Virgin Energy wielder, where maintaining chastity remains critical to harnessing Japan’s defensive power.

Acting as a mediator in Shiokaze’s disputes with academy rivals like Satsuki Yukimizawa, his interventions often devolve into slapstick chaos: accidental collisions, clumsily timed interruptions, and exaggerated reactions that amplify tensions. These antics underscore the friction between societal expectations of domestic life and the austere demands of military service, contrasting his pursuit of marital convention against her obligation to preserve Virgin Energy.

Mau’s documented background revolves exclusively around his relationship with Shiokaze and his naval cadet role, with no expansions into supplementary narratives or alternate media adaptations.