Gouki Mutou, a Tokyo Butei High School honor student in the Logi department, specializes in transportation operations. Standing 170 cm tall with spiky hair, he demonstrates unparalleled skill in maneuvering diverse vehicles—from scooters and high-speed trains to nuclear submarines—and modifies them for peak performance, such as a rocket-like scooter demanding specialized handling. Dubbed a "Transportation Otaku," his encyclopedic mastery of land, sea, and air machinery cements his role as a mission-critical support asset. He favors a Colt Python revolver for its reliability and low maintenance, a pragmatic choice diverging from typical Butei preferences. Approachable and loyal, Gouki aids allies like Kinji Tohyama in combat and logistics, yet revels in teasing peers—particularly Kinji—about romantic entanglements during interactions with female classmates. This playful streak coexists with earnest teamwork, exemplified by his tactical precision during operations. The OVA reveals lighter flaws: a mischievous attempt to spy on a hot spring bathhouse underscores his voyeuristic curiosity, while a panicked encounter with Jeanne d'Arc exposes an intense dread of the supernatural. His name, Mutou Gouki, blends "military" (武) and "wisteria" (藤) in his surname, with "sturdy" (剛) and "spirit" (気) forming his given name.