Ninja hicho fukuro no shiro / Castle of Owls (1963)

With war against Korea looming on the horizon, Toyotomi Hideyoshi; the Taiko, becomes the target of an assassination attempt to be carried out by the Iga Clan of ninja spies. Master spy Tsuzura Juzo is assigned the task, but first he must defeat a former Iga spy who has become a traitor, and outwit the treacherous woman that is trying to seduce him.