Kazuyoshi Aoyagi is an old friend of Natsumi and a founding member of Club TG. His counterpart of Nega World was killed by the Dark Riders and supplanted by Dark Kabuto. Under orders from Otoya, Kazuyoshi/Dark Kabuto and his partners tricked Natsumi to meet her Nega world counterpart and lead them to his treasure (The Decade K-Touch). He dies battling Decade in his Complete Form.