Otsuya Funagai commands and trains the Battle Soles, a specialized military unit of artificially enhanced female pilots designated Wet Prope subjects. Operating under the Alta Mira Agency defense organization, this unit repels extraterrestrial threats using advanced mechs called Skelters. His duties include overseeing pilot training, coordinating combat missions, and ensuring success against hostile squid-like alien entities appearing in Tokyo.

He maintains professional relationships with pilots Rin Ichikawa, Misaki Kashima, Konomi Tamura, Midori Matsumura, and Ayaka Matsumoto. His dynamic with Rin Ichikawa evolves beyond a standard commander-subordinate relationship into an intimate emotional connection. This personal bond creates significant conflict, especially when Rin's actions or safety during critical combat operations threaten mission objectives. His decisions in these moments reveal a willingness to prioritize Rin's well-being over strict protocol, challenging his duty to the agency.

During a pivotal mission against a giant squid-like alien in Tokyo, his emotional attachment to Rin compels him to disregard operational orders to ensure her survival. This choice results in disciplinary action from the Alta Mira Agency, leading to his dismissal from the unit approximately one year before a subsequent large-scale alien invasion. The circumstances of his departure involve the deletion of his contact information and severance of official ties, indicating permanent removal from his command position.

Information regarding his origins, life outside the Alta Mira Agency, or specific character development across media adaptations is absent. His background prior to assuming command of the Battle Soles unit remains unexplored.