Samurai Reincarnation , Makai Tensh? is a 1981 film directed by Kinji Fukasaku and starring Sonny Chiba. The film was based on the novel Makai Tensho.
Following the massacre of many thousands of Christians by soldiers of the Tokugawa Empire after the Shimabara Rebellion, Shiro Amakusa renounces the God who he feels abandoned them, and bargains his soul to the forces of darkness for the power to take his revenge. He gains the power to resurrect the dead, and begins with Hosokawa, the wife of a samurai who mocked her for her chastity and then left her to die during the invasion. Shiro restores her beauty in exchange for her loyalty. Next, they travel to the cave of legendary swordsman Miyamoto Musashi, who regrets that he neglected his lovely wife to find more opponents to duel, and that his advanced age prevents him from challenging the one rival he considered worthy to test his technique. He initially resists the pair, but suffers a heart attack and agrees to join them. During this exchange, his cave is visited by Yagyu Jubei, son of a samurai master and a powerful swordsman in his own right. Jubei rushes to Musashis aid only to find an empty suit of armor. The unholy trio then encounter Inshun, a Buddhist monk who is plagued with terrible fantasies of sex and death. Hosokawa taunts him with the failings of his monastic teachings, and he commits suicide in despair, becoming one of Shiros undead in the process.At a local Iga ninja village, young Kirimaru is excited to learn that Jubei is on his way. However, before he can arrive, their Tokugawa controlled rivals the Koga ninja ambush the village with flaming arrows, killing everyone except Kirimaru. He fights his way through the forest against a female ninja, and is mortally wounded, but the female ninja is assaulted by Inshun. The rest of the Koga attack, but are quickly dispatched by the undead warriors. A dying Kirimaru is tenderly offered resurrection by Shiro, and he accepts. Jubei returns to the village to find it in shambles, and goes looking for Kirimaru. He encounters the undead battalion, now on horseback, and they taunt him before leaving, promising to
Source: Wikipedia