A romance of a man who risked his life at sea on a Kitamae ship during the Edo period. Based on the famous book "Offshore of Rape Blossoms" by Ryotaro Shiba, the movie tells the story of Kahei Takadaya, a great merchant who lived a turbulent life and single-handedly conducted diplomacy with the great Russian power.

江戸時代、北前船で命をかけて海に生きた男のロマン、たった一人で大国ロシアと外交を繰り広げた心意気、司馬遼太郎の名著「菜の花の沖」を原作に、波乱万丈の生涯を送った大商人、高田屋嘉兵衛（たかたやかへえ）の物語を、壮大なスケールで描く。