Suddenly finding himself in the Sengoku era, regular high school student Sagara Yoshiharu is about to be killed on the battlefield. He is saved by none other than the man who was destined to become the infamous Toyotomi Hideyoshi, who dies while saving him. With the course of history now changed due to Yoshiharu’s actions, he tries to make things right again, but it seems that history is taking a different course than the one he learned in school. Oda Nobunaga is now a brilliant but young girl named Oda Nobuna. Yoshiharu starts working under her command while attempting to bring history back to its correct course and find his way back to the present world.