Saburo, an ordinary high school student, travels back in time to the Sengoku era (1549). He encounters a young lord who looks exactly like him and is told, "Be my substitute. I'm the eldest son of the Oda family, Oda Nobunaga." After the young lord leaves, Saburo is mistaken for Nobunaga by a vassal and taken to the castle. He starts to live as Oda Nobunaga from this day. The young samurai of the Oda family, which is merely a minor feudal lord, set out towards the extraordinary dream of unifying the whole country through the power of Saburo. Saburo, a person from modern times who has no experience killing people, does not understand the willingness of the warlords of the Sengoku era to lay down their lives for their family. It is the same for the vassals too. They have had a hard time understanding Nobunaga's actions ever since the ill-mannered, willful Saburo took over. Despite this "generation gap across space and time", they are soon on the brink of achieving their dream.