is a historical fantasy novel by Futaro Yamada. It was serialized in Osaka Shimbun newspaper between December 1964 and February 1965 under the title Oboro Ninpà Âchà Â.
It is a tale in which Mori Sà Âiken resurrects other dead historical figures to overthrow the Shogunate, while Yagyà « Jà «bei Mitsuyoshi rises to fight him and his warriors of the dead.
The tale starts in the Tokugawa shogunate, immediately after the Shimabara rebellion, when Yui Shà Âsetsu and Miyamoto Musashi stumble upon Mori Sà Âiken using a ninpou magic, Makai Tenshà Â, to resurrect Amakusa Shirà  Tokisada and Araki Mataemon. Realizing his power, Shà Âsetsu begs Sà Âiken to take him along as they depart. Several years later, they return with undead army of legendary warriors and sorcerers, among them Miyamoto Musashi and Tamiya Bà Âtarà Â, and plan to use their supernatural skills to destroy the shogunate. However, the crown of their army, Yagyà « Jà «bei Mitsuyoshi, breaks free from their control and becomes determined by his own reasons to stop their rebellion before it starts.
The roster of the dead varies depending on adaptation, but usually contains Amakusa, Musashi, Yagyu Munenori, and Hà Âzà Âin Inshun. Soiken himself is often left out in adaptations, which tend to have instead Amakusa as the villain mastermind of the story.