Kyōtarō Imura serves as the undercover alias for FBI agent Kyōtarō Yamada, who infiltrates Professor Menoa Bellucci's research team as her assistant during her New York-to-Japan travels. Concealing his true identity, he maintains a professional appearance with fair skin, black hair shaved beneath the crown, black eyes, and consistent attire of a grey shirt, dark grey necktie, black suit, and black shoes. His imposing height and habit of bluntly vocalizing thoughts create an intimidating presence. Yamada's covert mission targets Menoa’s connection to Eosmon, a Digimon abducting DigiDestined children worldwide and trapping their consciousnesses. He discreetly gathers evidence, including extracting Eosmon’s data from Menoa’s hard drive. During the abduction crisis, he pragmatically blocks Yamato Ishida’s attempt to rescue Takeru Takaishi and Hikari Yagami, recognizing intervention as futile after their capture by Menoa. His allegiance emerges when he reveals his FBI status to Yamato, redirecting suspicion onto Menoa as the kidnapping mastermind. Following Eosmon’s defeat, Yamada arrests Menoa, concluding his investigation. No details exist regarding his background, personal motivations, or activities beyond this operation.