"Nobunaga Concerto" is a historical fantasy anime that reimagines the life of Oda Nobunaga, one of Japan's most famous feudal lords. The story begins when Saburou, a modern-day high school student, accidentally time-travels to Japan's Sengoku period. After falling off a school rooftop, Saburou finds himself in the body of a young Oda Nobunaga, who has fled his responsibilities as a feudal lord due to his frail health and lack of confidence. Saburou, who bears an uncanny resemblance to Nobunaga, is coerced into assuming his identity to prevent political chaos.

Despite his initial reluctance and lack of historical knowledge, Saburou embraces his new role, using his modern-day perspective and unconventional thinking to navigate the complexities of feudal Japan. His carefree and bold personality contrasts sharply with the expectations of a traditional daimyo, leading to both comedic and dramatic situations. Saburou's actions begin to alter the course of history, as he forms alliances, outmaneuvers rivals, and gradually earns the loyalty of key figures such as his retainer, Tokichiro Kinoshita (later known as Toyotomi Hideyoshi), and his wife, Kichou.

The narrative explores Saburou's efforts to unify Japan, blending historical events with creative liberties. His relationships with historical figures, including Akechi Mitsuhide and Imagawa Yoshimoto, are central to the plot, as are his struggles to balance his modern sensibilities with the brutal realities of the Sengoku era. The series delves into themes of leadership, identity, and the impact of individual actions on history, while maintaining a balance between lighthearted moments and serious political intrigue.

The anime adaptation, which combines traditional 2D animation with 3D CGI, captures the essence of the original manga while emphasizing the dynamic and often chaotic nature of Saburou's journey. The story remains focused on Saburou's growth as a leader and his efforts to reshape history, offering a fresh perspective on a well-known historical figure and period.