The Tsuru family is a family of nine, headed by Kamejiro. Kamejiro is the president of a construction company that has made a fortune in its first generation, but he is a one-man family. His wife, Aiko, is a typical good wife and wise mother type. Kamejiro gets angry and thunders down every week, and the children are afraid of him, calling him "Oyaji Daiko", but he also takes advantage of this.