In a small town on the Kasumigaura coast in the early Showa period, the Masukawa clan from Tokyo is trying to take away the interests of the local Isetoku family. Setsuko, the adopted daughter of the Isetoku family, falls in love with Seijiro, a travelling raven she meets on a whim. However, Koide, a businessman connected to the Masukawa clan, wants Setsuko to become his mistress... Setsuko puts aside her love and her regrets and bets on the greatest female challenge of her life!