One Step to Happiness

Three beautiful daughters grew up in a dog and cat care clinic. The eldest was named Takako (Keiko Tsushima), the second was Tsugumi (Keiko Awaji), and the third was Mihato (Hibari Misora). Mihato was still a pretty seventeen-year-old girl, but she considered herself as mature as her older sisters. Mihato knows that Tsugumi is friends with Ippei Yaguchi (Masao Wakahara) and acts as a love messenger between them, but she didn't know that Takako is also in love with Ippei...

A woman diver in great peril is rescued by Shinji, a fisherman. But his deed is belittled by Takiko, another diver, as a rash act. Her attitude, however, is nothing but a cloak to hide her affection for him. Shinji, hard working and manly, becomes the focus of many yearning eyes and Seikichi, the boss' son, picks a quarrel with him and violent fight ensues in which Shinji kills a man in self-defense.

During the era of Tokugawa Ieyasu, one night a carver named Fujijiro was murdered. Immediately launching an investigation, Denhichi, accompanied by Otoshi and Take, toured the entertainment houses of Ryogoku. There, they discovered a connection between an acrobat and the incident. On their way home, Otoshi unexpectedly encountered an old friend, Inosuke, nervously buying a dagger. Inosuke, a clerk at the Kashimaya store, was in love with Oko, a secret lover of Bunzaemon. Amidst this, Seihei, the head clerk, was murdered by someone, and a dagger belonging to Inosuke was found at the scene, leading Gohei to suspect Inosuke as the culprit. However, Otoshi was hiding Inosuke. Driven by Otoshi's plea and a professional instinct that Inosuke wasn't the perpetrator, Denhichi desperately searched for the real culprit.

In a certain port town, there is a group of young men called the Wakakusa-kai. The chairman Oda (Miki), member Ichiro Sonoda (Ishihama), his sister and music lover Keiko (Misora), Keiko's classmate Sachiko (Ota Chieko) and her brother Shoji (Yamada) meet enthusiastically to brighten the town and help themselves grow. Ichiro's family lives with his father and Keiko in a milk shop, but Keiko's desire to go to music school is unlikely to be fulfilled. Meanwhile, Shoji's father is trying to get Shoji and Keiko married.

Former boxer Goro Kawasaki was attacked by the organizer of the fights for knocking out his opponent because he could not stand the fight. He is being released from prison, where he was imprisoned on charges of causing bodily harm. He meets his younger brother Fumio, who is going to become a boxer and dreams of owning his own car repair shop. Goro tries to help Fumio, but is refused. At this time, the boss of the underworld, whom Goro met in prison, is released, and this escalates into a confrontation involving Goro and Fumio.