After World War II, a black American went to Japan to look for his mother.

In the elevator of Tokyo Royal Hotel, a young black American was suddenly stabbed to death. According to the investigation, the name of the deceased was Johnny (), who came to Japan from the United States to look for his biological mother. So, who killed Johnny? Who's his mother? After a series of police investigations, it turns out that he has been looking for and finding the mother who killed Johnny-Japanese fashion designer Kyoko Yagi (Mariko Okada).

Johnny's black father, Wilshire 1946- 1949, served in Japan. At that time, Kyoko Yagi made a living as a soldier, lived with Wilshire and gave birth to a black child, Johnny. Later, Wilshire returned to America with her children. Years later, son Johnny looked for his mother, and mother Kyoko killed Johnny in order to protect Johnny's honor and status and keep the future of another son, Gongping, who was born later. Gongping fled to the United States for committing a crime and was finally killed by the police. When Yasuko Angu won the grand prize at the 1978 annual fashion design award ceremony, the police arrested the murderer at the venue. Kyoko Yagi saw that her two sons were dead, and it was difficult to suppress her inner pain and complicated emotions. She committed suicide before coming to the cliff.