Tadashi Agi graduated from Tokyo Metropolitan Musashi Senior High School and Waseda University's School of Economics & Political Science. He won the 2003 Kodansha Manga Award for Shounen, which he shared with his sister Yuuma Andou, Yuuya Aoki, Jyoji Arimori, Hiroaki Igano, and Ryuumon Ryou. The other winners were S.K., Seimaru Amagi, Kibayashi, and Ryuumon Ryou.