Shigeru Yūdai (茂 雄大, Yūdai Shigeru), feared as the Betrayer of Hope (密告者の希望, Mikkokusha no Kibō), is an international criminal under the protection of the Ryū Order. He is the adoptive father of Akiye, a mentor of Kentaro's and the latter's godfather, as well as an old ally of Kenji, Kusaka and Yoshiro.