Onmitsu Hicho

Original title: 隠密秘帖

Directed by Takashi Isshiki

Pilot for a TV series. In the pilot Hiroshi Tachi is a lower ranked samurai investigating the the murder of Tanuma Okitsugu's son Mototomo by Sano Masakoto. Those events are a matter of history but the plot that Hiroshi unveils and is eventually killed for is fictional.