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.

Omori Ippei (Katori Shingo), who used to be a news program producer, was fired by the TV station due to an ominous incident and was forced to leave.Now, he has moved into the hometown left by his father. Although he calls himself a freelance journalist, he lives a bleak life of almost unemployment.One day, Ippei received advice from Kaojiro Makabe (Aru Yasuda), the second secretary of House of Representatives member Tetsuo Kuroiwa (Jun Hashimoto) and a friend from elementary school, and decided to transform into a politician and determined to be elected in the next district council election., to restart life.

For this reason, Ippei found his brother-in-law, Ohara Masasuke (Shison Jun), a single father who raised two children by himself, and asked him to live with their family.However, hidden behind this living arrangement is Yiping's strategy of using them to create a persona of themselves who are good at housework and childcare and get closer to voters' lives during the election.

Yiping has a younger sister named Harina (Mukari Yuka).Due to Yiping's busy work as a reporter, the relationship between the brother and sister is estranged, and all the care of his father falls on Hina's shoulders.Soon after, Hina got married and gave birth to her eldest daughter Tsubasa (Masuda Risa), but later divorced.Afterwards, Hina and Masuke remarried and gave birth to their eldest son Asahi (Sojiro Chiba). The family of four lived a happy life, but Hina passed away after fighting the disease.

Zhengsuke, who shoulders the responsibilities of work and childcare alone, feels uneasy about life, and Yiping proposes "I will support your childcare", which makes Zhengsuke sincerely grateful.Yiping said to Masuke: “Leave it to me, no problem”, and therefore he was full of enthusiasm for life with this “fake family”...

Omori Ippei (played by Shingo Katori), who retired from a television station and lived an ordinary life like a jobless vagrant, decided to become a politician in order to make a comeback.In order to show his perspective as a sei-katsu-sha in the election, with this “ lowest ” idea, he lived with his single father's brother-in-law, Ohara Masasuke (played by Jun Shison) and his family.Ippei struggles with housework and childcare that he is not used to.However, behind the scenes, he declared to his childhood sweetheart Kojiro Makabe (played by Akira Yasuda) that he would act in a family drama...

One day, Makabe suggested that if Ippei wanted to win the election, he must first get the support of Shintaro Nikaidou (played by Ryo Iwamatsu), a powerful local figure and the town president.Shintaro is the father of the Sword Master (Reo Sano) and works as a nursery school at the nursery of Ippei's nephew, Asahi (Sojiro Chiba). Since the death of his wife, a man has single-handedly raised him.Knowing that Ippei was in a similar situation to Masuke, he and Makabe immediately went to see Shintaro.

Shintaro, who had a cold attitude at first, found out that Chaoyang was under the care of the Sword Master, and asked Ippei to tell him to let the Sword Master show his face.Shintaro and Juggernaut have been estranged for a long time for some reason.

On the way back, Ippei saw the sword master at the Italian cafe in Imanaga (Tominaga Ai) and said hello.So, the sword master and the man Tomoya Hiiragi (Da Nakai) got together...