Ukai serves as a self-proclaimed professional within the Arahabaki resistance, fiercely opposing Shinkoku Nippon's occupation of Japan. His critical role focuses on procurement, securing vital supplies ranging from essential gear to specialized weapons like Genmu gas and Gann robots for the group's operations. Despite his hardened, rough exterior, Ukai is a genuine otaku, his deep engagement with subculture interests forming a stark contrast to his outward demeanor while working within Arahabaki. A pivotal revelation occurs during the climax when antagonist Akatsuki Shinonome learns Ukai's American nationality, exposing that many resistance fighters are not Japanese. This disclosure challenges Shinonome's assumptions and uses Ukai's background to question rigid nationalist ideologies, highlighting the diverse motivations within the struggle against the occupation.