is Sen's older brother, president of the Student Council, and head of the Tokugawa Shogunate. He believes that he is doing the best for his country, while in reality he is a ruthless tyrant with a tendency to use and discard people, including his own sister. Yoshihiko had a brief relationship with Charles d'Artagnan until he used her in one of his experiments to create Master Samurai by artificial means. He had also used other girls in his experiments as well, planning to create an army of Master Samurai since there are very few in existence. In the endAfter realizing his feelings for d'Artagnan after she sacrifices herself to save him, he revives her by making a Master Samurai contract with her, and later teams up with Muneakira to defeat Gisen.