Shoichi Kokubun (Yujiro Ishihara) 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.
石原裕次郎
as Shoichi Kokubu
青山恭二
as Eiji, Shoichi's brother
小夜福子
as Sadayo, Shoichi's mother
石原まき子
as Miyako Fukushima
岡田眞澄
as Shinsuke, Miyako's brother
高野由美
as Aiko, Miyako's mother
芦川いづみ
as Midori Shima
山田禅二
as Zenzo Shima
Keiko Amaji
as Tokiko Arima
白木万理
as Mary Oka, the dancer
笈田敏夫
as Charlie Sakurada, the drummer
金子信雄
as Toru Sakyo, the critic
