Apparently a highly-placed member of the Imperial Bureaucracy, his full name and exact position remain unknown.
Has a connection with Kasuga Osamu. This is the man who sponsored him for the Topaz Championship. He had never met him, but the Tortoise Clan are known to have long had the favor of the emperor for some unknown reason. To receive such unexpected support from a member of the Imperial Families is unusual, but no more so than anything else surrounding the Tortoise. He claims to have been paying attention to Kasuga and his career since then with some interest.
While in Otosan Uchi after their trip through the Shinomen Forest, Kasuga Osamu was contacted by Otomo-san, instructing him to seek out “Kasuga Ran”. The woman who would later be identified as Isawa Ran.
Murdered by the black-clad strangers on the bridge during the prisoner exchange of the half-gaijin boy for Mirumoto Tetsuzae. While dying he told Kasuga not to trust anyone and informed him that a group referring to themselves as The Council were involved, doing what they felt necessary for the future of the empire.