Four criminals break into the home of a jewelry merchant, Sanpodo, rob the diamonds, and escape. However, one of them receives a bullet during a skirmish between bandits, and the second is wounded by the police. To help their wounded comrades, criminals lock themselves in a city clinic...

The young Takako Kuramoto has come to Tokyo to study and starts working for the rich Tashiro family as tutor of the daughter, Kumiko, while she receives attention from her two older brothers, Yukichi and Shinji. Meanwhile, the exact parentage of Shinji comes to light.