I found a higher quality recording, this time with subtitles! Due to the quality difference, I believe this was recorded at a different date.
TOKUGAWA IEYASU'S SECRET TREASURE
(Tokugawa Ieyasu no Hibo)
1992 – Color – 140 min. –
Starring: TAKASHIMA Masahiro, NATSUYAGI Isao
KATASE Rino, KUROKI Hitomi
KOYAMA Shigeru, TSUGAWA Masahiko
Directed by: NAKAMURA Atsuo
Ukita Heishiro, champion of Toda Ryu School, pledged his sword to his mentor Honda Masashige, retainer of the Maeda Clan. But his deadly blade will be awash with blood when Masashige draws Ukita and a small band of warriors into a quest to unravel the secrets of the late Tokugawa Ieyasu. For Lord Yagyu Munenori, desperate to find the shogun’s hoard of gold, will hurl deadly ninja blade for blade against them. And Ukita will face the most brutal swordsman in Japan… the ruthless Yagyu Jubei. In the struggle Ukita will win the love of two dangerous women: a beautiful, deadly warrior and the lovely prophetess of the forbidden Christian faith. Soon his quest will touch off a whirlwind, bringing Maeda Clan to the brink of total war against the shogunate.