In a warehouse area at night, a drunk chief engineer is stabbed to death by someone who whistles. After the break of dawn, two seamen join the crew of a rusty cargo ship Kaiyo Maru. One is a troublemaker with bad attitudes, Senkichi Nomura, who pursues an enemy in order to take revenge for his father's death. The other is Keizo Sasaki, a buff, eagle-eyed man on board for a certain mission.
Kawai Midori's father left the family a long time ago and since her mother passed away, she has taken care of her younger siblings by herself by working with a group of itinerant camellia oil peddlers. While she is In Izu selling camellia oil, she meets a young student, Katō Yutaka, who asks her to let him take her picture. The peddlers also meet a jazz band, and when Midori sings a song, teased by the band's star singer Nanjō Haruo, the band members are enraptured by her beautiful voice. She eventually joins the band and quickly becomes a popular jazz singer.
It’s been five years since her husband had passed away. Fuyuko lives in the quiet suburbs, in a small but loving home with her three beautiful daughters. Haruko, the eldest, is the lead vocalist in a band. Natsuko is the conscientious type, who spends her days in ballet classes beautifying herself. The youngest of the three, Akiko is a bookworm who found her niche in philosophy. Although the sisters may appear to have nothing in common, there is one thing they all agree on; "Mom needs a new husband".
