This drama tells the story of Omori Ippei, a poor man who is pushed to the edge of life and hates his family and children. In order to be elected as a member of the parliament, he lives with his single father's brother-in-law and his children.In the process of facing family, social and Japanese problems in daily life, the worst man, his brother-in-law and their children gradually established a relationship like a real family, and gradually began to want to create a better society, and finallySeriously participating in the election and becoming a candidate depicts “Number one worst man in Japan”'s struggle to change his family, society and Japan.