Nobuko is a plain, unattractive woman with disheveled hair, and is hired as a housekeeper in the Inamura residence in Tokyo. The Inamuras are a family of six. The father, Tatsuya, is the head of a university hospital's department of internal medicine. He lives with his wife Haruko, their three sons, and Tatsuya's mother, Shigeko. Although the Inamuras appear to be a happy family, Nobuko soon uncovers the truth.

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