Tough Gaiden - Ryuu Wo Tsugu Otoko summary: The series starring one of illegitimate children of Kiryu Miyazawa, Ryuusei Nakamura. Years after Kiibo founded the new dojo, both him and Kiryu mysteriously disappeared. Ryuusei, after losing his mother to cancer, is set to find out about his birth father and his destiny as the evil dragon’s heir, but he is not the only one.