Shoichi Kokubun is a roughneck street musician, who has a brother that is determined to propel him into stardom. In attempt to catch the attention of a popular jazz band, his brother appeals to their manager who has the power to make him a star. In a graphic portrayal of love, betrayal and success, Shoichi brews up a storm with a 'rat-a-tat-tat' on the drums.

Yūjirō Ishiharaas Shoichi Kokubu
Kyōji Aoyamaas Eiji, Shoichi's brother
Fukuko Sayoas Sadayo, Shoichi's mother
Mie Kitaharaas Miyako Fukushima
Masumi Okadaas Shinsuke, Miyako's brother
Izumi Ashikawaas Midori Shima
Zenji Yamadaas Zenzo Shima
Keiko Amajias Tokiko Arima
Mari Shirakias Mary Oka, the dancer