'Sengoku Witches Honnoji no Maho' is set during the Sengoku or 'Warring States' period of Fusoan hsitory. (The 15th to 17th Centuries.)
The story centers around the witch Mori Ranmaru (based on the actual Mori Ranmaru,) Oda Nobunaga, and the events leading up to the Incident at Honno-ji. (Where Oda Nobunaga was killed in normal history.)
Mori and Nobunaga's relationship is explored, as well as the reasons for the actions of several other important persons involved in the Incident at Honno-ji.
Additionally; the short-story 'The Day of the War Maiden' tells of Nobunaga's actions after Honno-ji, as well as providing additional information in a post-script that explains developement of Fuso as a nation.