Sarutobi Sasuke and the Army of Darkness 1 - The Heaven Chapter (2004)

In order to murder Tokugawa Ieyasu to overthrow his reign, Sarutobi Sasuke put a group of young men under a cruel and deadly form of trainment to become ninjas. At the same time, two brothers hired by Tokugawa try to find the localization of their hideout, and a spy hides among the students.
Part 1 of a 4 part series about Sarutobi Sasuke.