Kakushi ken: Oni no tsume

In the mid-19th Century, a samurai named Munezo leaves his clan's fiefdom to take a position in Edo, while his friend Yaichiro is sent home in disgrace after a failed political intrigue. Munezo's sister marries Samon, and his mother dies, leading him to learn Western warfare methods. He falls in love with Kie, a maid, but their social differences make marriage impossible. Munezo is ordered to kill Yaichiro, who has taken hostages, and seeks help from his old teacher, sword master Kansai Toda, who taught him the "Hidden Blade" technique.