Nobunaga Concerto

Due to some unlikely events, Saburo is flung back in time to the Sengoku Era. In the past, he meets a young, but sickly Oda Nobunaga, one of Japan’s greatest war lords. Unable to shake Saburo’s uncanny resemblance to himself, Nobunaga asks Saburo to take his place as war lord. Equip with knowledge from the modern era, will Saburo be able to unite Japan? (Crunchyroll)