When he began what would become the Shinobi no Mono series, Satsuo Yamamoto had wanted to put a more realistic spin on the ninja movie, shifting from the fantasy-esque wuxia with which the genre had been associated since the silent days to something that was largely devoid of romanticism. In the films he directed, the ninja are powerless manipulators doomed to live unhappy lives defined by a cruel and heartless code. Though still based on the same novel, the third film began to compromise that vision in the hero’s miraculous escape from certain death, ending on a note of ambivalent positivity in which Goemon declines the offer to join Ieyasu and instead walks out into independent freedom. 

The first three films had covered all of the action in Tomoyoshi Murayama’s serialised novel, and so the following four are based on original ideas by screenwriter Hajime Takaiwa save for episode six which is scripted by Kei Hattori and Kinya Naoi. Many of the same actors appear but in different roles while the action has moved on 15 years, skipping ahead from the unseen battle of Sekigahara to the siege of Osaka and the end of the Toyotomi. Raizo Ichikawa stars as another displaced Iga ninja nominally in the service of the Toyotomi but secretly longing to bump off Ieyasu not for reasons of revenge but because there is no place for ninja in his new and peaceful society. If they’re able to unseat him, they assume the situation will revert to the civil war society with the effete Hideyori (Junichiro Narita) too ineffective to assume control over the nascent nation. 

It has to be said, this version of events has rather misogynistic overtones with frequent speeches from Sanada Yukimura (Tomisaburo Wakayama) avowing that it’s all Lady’s Yodo’s (Otome Tsukimiya) fault for giving her son bad advice that he is too naive to know not to follow. In negotiating to end the siege at Osaka castle, Yukimura had advised it was better to strike back against Ieyasu and kill him as soon as possible, but Lady Yodo vetoed it and insisted she and her son remain locked up in relative safety. His conviction is somewhat born out seeing as Ieyasu had deliberately targeted the area of the castle where they assumed she was staying in order to further frighten her.

Nevertheless, he’s astute in realising it was all essentially a ruse and part of Ieyasu’s plan to force the Toyotomi into submission. The attack on the castle was only ever intended to engineer a peace treaty which Ieasyu himself presented and forced Hideyori to sign. Then again, there’s some strange symmetry in play. When Saizo enters the castle in an attempt to assassinate Ieyasu he mangles to trick him into killing his double instead, then when Ieyasu’s ninja try to assassinate Yukimura after following Saizo having known he would pretend to be dead and dig himself out of his own grave they also kill his double much to Ieyasu’s consternation. 

It’s this similarity that Saizo hints at when he pities a retainer of Ieyasu’s explaining that Nobunaga and Hideyoshi had tried to eliminate them but they survived while Ieyasu now wants to use them for his own ends but will likely do the same when they are no longer necessary to him. Thus what they want is a kind of chaos, desperate to assassinate Ieyasu to return to the world in which the ninja are able to influence events from the shadows. Even so his conviction is apparently shaken. As in the previous series, Saizo gains a love interest, Lady Akane (Midori Isomura), who has become a sex worker as an apparent act of self-harm after being raped by Tokugawa soldiers during the fall of Osaka castle. But as we’ve been repeatedly told, a ninja’s heart lies under the blade. Born in darkness, they shall die in darkness and are not permitted to fall in love. Thus Saizo rejects her affections, but eventually declares himself corrupted by wanting to die alongside Yukimura as a loyal soldier. The in-film lore would have us believe that Yukimura did not in fact die during the final assault but was spirited away by Saizo to plot Ieyasu’s downfall in the shadows. 

Directed by Tokuzo Tanaka in his only instalment in the series, the film is shot more like a conventional jidaigeki but returns something of the fantasy aesthetic to the ninja as they somersault through the forest. Saizo’s surname effectively means “hidden in the mist”, which is partly ironic seeing as Akane also describes her rape as being overcome by a thick fog, but is also symbolic of his frequent use of smoke bombs as a disappearing trick which again undermines the sense of realism with which the series began. Yukimura is fond of declaring that the clock cannot be turned back, a sentiment echoed by Akane and emphasising the sense of melancholy fatalism that cannot be avoided in a historical drama in which the outcome is already very well known, imbuing Tanaka’s take with the sense of elegy and legend Yamamoto had so deliberately rejected.