A private lawyer (Hiroshi Mikami) who is infatuated with the widow of the Mamiya conglomerate (Emi Shindo) and aims for her inheritance. But he had multiple personalities. One day, university student Kawashima Megumi is mistaken for her older sister, Maiko. She is given a key to a coin locker, and finds inside the diary of Maiko's real father, a zaibatsu leader. Using her sister's name, Megumi gets close to the widow of the zaibatsu leader.

The drama begins in August 1945, three days after the end of the Pacific war. A freight train completely jam-packed with passengers heads for Aomori from devastated Tokyo. On the train is Takahara Miki and her sister Sachi. Miki and Sachi are the daughters of a wealthy landlord living in a village in the Tsugaru area in Aomori prefecture, but they have been living in Tokyo since before the war to attend school. After seeing her village does not have a doctor, Miki is determined to become a rural doctor.

On March 23, 1585, Japanese Christian envoys visited Pope Gregory XIII at the Papal Court in Rome, Italy. The drama begins 45 years earlier - in 1540 outside Lisbon, Portugal.