Sanada Maru is a 2016 Japanese historical drama television series and the 55th NHK taiga drama. The series is named after the Sanada Maru, a fortification defended by Sanada during the Siege of Osaka in 1615. Written by Kōki Mitani, it stars Masato Sakai as the samurai Sanada Nobushige. It premiered on January 10, 2016 and concluded on December 18, 2016.