Saneatsu commands the Hagoromo airship, home to the Kotobuki Squadron and part of Madam Loulou's Ōni Company. He struggles with indecisiveness and unreliable leadership, frequently needing others' guidance to complete his duties. Madam Loulou's confident and imposing presence intimidates him, often leaving him flustered during their interactions.

Within the Hagoromo crew, Saneatsu faces criticism, particularly from senior member Anna who openly challenges his judgment. This friction highlights his difficulties with authority and command effectiveness. While holding the commanding officer role, his contributions focus primarily on administrative and logistical support rather than tactical leadership during aerial engagements. His anxious, easily pressured personality often serves as a source of comedic relief.

Saneatsu's character, backstory, and role remain unchanged across the series episodes, the 2020 film *The Magnificent Kotobuki Complete Edition*, and related spin-off media like the mobile game *Kōya no Kotobuki Hikōtai - Ōzora no Take Off Girls!*. He consistently functions as a secondary figure facilitating the Hagoromo's operations, his presence contrasting with and thereby highlighting the competence of surrounding characters.