Case of Umon: Hell’s Windmill Released 1960-03-01 is a story that falls under the History, Mystery, Action category. Movie Story "Umon’s services are called upon when innocent bystanders, Kayo and Minokichi, along with the ronin, Gontaro are mistakenly identified as suspects in several recent murder cases. To prove their innocence and uncover the truth, Umon launches his own investigation.".