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From the liner notes

The Hidden Blade is the epic tale of Munezo (Masatoshi Nagase), a samurai being displaced in a rapidly changing Japan. He was raised to respect tradition and the demanding moral code of the samurai -- but now circumstances are forcing him to make difficult personal and political choices. After a political coup fails, he is ordered to prove his innocence by finding and killing Yaichiro, a former friend, samurai, and brilliant swordsman. Munezo secretly enlists the help of their former master who entrusts him with the secret of the "hidden blade". Now he must choose between duty and honor. (Japanese with optional English or Spanish subtitles)