Sekigahara (関ヶ原) is a 2017 jidaigeki Japanese film directed by Masato Harada starring Junichi Okada as Ishida Mitsunari.
Hideyoshi unifies most of Japan and takes the title of taikō, but also grows erratic in his old age: He orders a series of expensive invasions of Korea to expand his holdings but his armies are defeated and most of his vassals are almost bankrupted.
After the maids of one of the condemned women attack Ishida and his men during the execution, Mitsunari is impressed by their loyalty to their lady and spares them, even recruiting one of them, a woman called Hatsume, to serve him as a spy.
Mitsunari and his longtime friend, Otani Yoshitsugu, correctly suspect that Tokugawa Ieyasu, the wealthiest lord in the country, will conspire to usurp control away from the Toyotomi Clan after Hideyoshi's death.
Tokugawa starts secretly conspiring with his vassals, Honda Tadakatsu and Ii Naomasa, to rise against Mitsunari after Hideyoshi's death, since they suspect he'll try to take control of the Regency Council that will govern until young Hideyori comes of age.
He also gains the favor of the Seven Spears of Shizugatake, Hideyoshi's greatly respected personal bodyguards, after sparing them punishment following a drunken brawl.
Just as conflict appears inevitable, a temporary truce is established due to the intervention of Maeda Toshiie, a respected lord who is friends with both Tokugawa and Mitsunari.
However, after a mission to secretly deliver messages to a severely-ill Otani, Hatsume is ambushed on the road by assassins sent by the White Snake, is captured and sold into slavery.
Guilt-ridden, Mitsunari orders that no more hostages be taken and then he begins to mobilize his army, joined by Otani, Sakon and Kobayakawa, the latter of whom is a double agent for Tokugawa.