The Ambition of Oda Nobuna

is a Japanese summoning-themed light novel series written by Mikage Kasuga and illustrated by Miyama-Zero. Volumes 1–10 and a spin-off novel were published between August 15, 2009 and March 16, 2013 by SB Creative under their GA Bunko imprint before the publishing was switched to Fujimi Shobo's Fujimi Fantasia Bunko imprint from Volume 11 onwards on April 19, 2014.

A manga adaptation written by Mikage Kasuga and illustrated by Futago Minazuki was serialized in Kadokawa Shoten's Comp Ace magazine from July 2011 to June 2014 and all chapters were collected into 6 tankobons.

It was adapted into an anime television series animated by Madhouse and Studio Gokumi that aired from July 9 to September 24, 2012, where Sentai Filmworks licensed the series in 2014 and released and simuldubbed the series on December 16, 2014.

Plot
Average high school student Yoshiharu Sagara finds himself time-slipped to the Sengoku period. He was about to be killed on the battlefield when he has saved by the sacrifice of the man who would later become the respected Toyotomi Hideyoshi. With the course of history altered as a result of these events, Yoshiharu tries to make things right only to discover a lot of things different from the history he remembers from his favorite Sengoku era video game. Above all, the Oda Nobunaga from present-day history is replaced by a young woman named Nobuna Oda who is the daimyō of her clan. Yoshiharu begins working under Nobuna's command, who nicknames him Saru (サル, monkey), with hopes of correcting hisotry to its correct course and finding his way back home.