Tomoyuki Katsuragi
About
It is revealed that Katsuragi is an illegitimate child of a very famous and beautiful geisha and Akihito's grandfather. Once he was born, not to shame the Kuze family, he was given to Katsuragi family. Tomoyuki's mother died shortly after. In his coversation with Akihito Katsuragi later sadly says that he's "no one's".
He is voiced by Hirakawa Daisuke in drama CD.