Miyoshi Seikei-nyuudou, also known as Miyoshi Harumi Nyudo, serves as a retainer of the Sanada clan, his Buddhist priestly rank denoted by the honorific "nyuudou." He takes part in the strategic opposition to the Tokugawa forces during the campaign for Ueda Castle, a critical prelude to the Battle of Sekigahara. Aligned with the Sanada faction, he aids in the defense against the advance of Tokugawa Hidetada's army, which moves to claim the fortress for the Tokugawa clan.