The episode starts off in Satsuma in 1835, 20 years prior to the arrival of the Black Ships led by Matthew C. Perry. People in Satsuma are excited by the arrival of the heir to the domain, Shimazu Nariakira, from Edo. Meanwhile, a long-awaited daughter is born in one of the cadet families of Shimazu clan, the Imaizumi Shimazu family. The father of the girl, Shimazu Tadatake, and the mother, Oyuki, name her “Katsu,” wishing the child’s happiness. Okatsu grew up as a tomboy, much stronger than her brothers, yet is warm-hearted and full of curiosity.

Zusho's financial reform successfully clears Satsuma clan's debt, however, many people are still badly off. Young samurai, including Saigo Kichinosuke and Okubo Shosuke, feel hatred toward Zusho. Meanwhile, Zusho invites Okatsu and Naogoro to his place, asking Okatsu a favor before he heads for Edo.

Oyura, concubine of Shimazu Narioki, the clan head, plots to make her son Tadayuki an heir to the Satsuma clan which provokes a serious confrontation within a group of samurai who stand by Nariakira, Narioki's legal wife's son. Shosuke is punished for his involvement in the family quarrel. Wishing to help Shosuke's family make ends meet, Okatsu offers food and money, however, Shosuke's mother, Fuku, refuses.

Nariakira succeeds as the head of the Satsuma clan. Although Nariakira is active in reform, Kichinosuke and other young samurai are impatient that Shosuke is not granted clemency. Meanwhile, Nariakira officially invites members of Shimazu's branch families to his place. On the day of Okatsu's visit, she asks Nariakira why he has not pardoned Shosuke.

Tadatake learns from Tadayuki that his son wants to marry Okatsu. Naogoro is upset to hear the news. Meanwhile, Naogoro meets John Manjiro who had just come back from the U.S. Inspired by Manjiro's free-minded way of thinking, Naogoro tells Tadatake that he too loves Okatsu. The next day, Tadatake is called up by Nariakira where he informs his plans of Okatsu.