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...

Ippei (played by Shingo Katori) learns that Masuke (played by Jun Shison)'s daughter Komari (played by Masuda Risa) often doesn't go to elementary school recently.Ever since her mother Hina (Mukazato Yuka) found out she was sick, she had a tendency not to go to school before transferring to another school.Ippei said "I want to tell you about the fun of school", but Masuke tried hard to respect Himari's ideas.

At the same time, Ippei came to the office of Representative Kuroiwa (Jun Hashimoto) of the Democratic Party and told Makabe (Ken Yasuda) about sunflowers.Therefore, Ippei and Makabe, while taking advantage of this situation for the election, worked on supporting students who were not attending school, and began planning to infiltrate the parents of the elementary school parent-teacher conference.

After getting the latest information about not going to school, Ippei said to Himari, "I will teach you to study. If you are tired, you don't have to go to school."Although the feisty Xiaobai went to school, during the break that day, he had a dispute with his classmates for “some reason”.Zhengsuke, who came after being contacted by the school, asked what happened, but Xian didn't say anything.And, because of this incident, I stopped going to school again.

At this moment, Yiping attended the parent-teacher meeting at Xiangyang Elementary School.So I brought up the topic of Himari, and proposed a party where parents of children who don’t go to school share their worries...

Yiping (Xiang Tu Shenwu) gradually became accustomed to the life of the family with Zhengzhu (Zhizun Chun), and even began to have an illusion. It is quite interesting to raise children.At this time, Shimoto (Akada) warned Yiping:“do not go upside down”, and proposes to carry out the next“community contribution activity”.He said that for the election, some people need to create some people, such as paying attention to family and caring for children.

One day, Yiping and Xiaokui (Magota Rya), Chaoyang (Chiba Erlang) went to the Italian coffee shop in the capital (Fu Yongai).After get off work, Zhengzhu also joined it, and Yiping happily enjoyed the time for the family to dine together.On the way home, Yi Pinghe was helping the family's frequency of meals, and the topic turned to“children's cafeteria.It turned out that when Yang Cai (Xiang Yiyou Xiang) was hospitalized, he was helping himself to receive the help of the children's cafeteria operated by volunteers.

Yi Ping was inspired from Zhengzhu's words. He wanted to let his figure appear in the news program. It reported that he opened the children's cafeteria and intends to use this measure to use his election activities.In addition, he also aimed at TV exposure. People who planned to be popular and invited on the topics on SNS were invited to jointly plan the opening of the children's cafeteria.

At the same time, Xiaokui is holding”of a certain trouble.However, she couldn't talk to Yipinghe Zheng helping ...

Ichihei (played by Shingo Kaoru) feels that it is no longer painful to star in a family drama in his life with Masasuke (played by Jun Shizun).Regarding such a Yiping, Mabi (Yamata Yoshihiro) told him not to forget his original purpose, and Yiping also replied that “ of his family is just a stepping stone ”...

At this moment, the new director of the Forpeace Nursing Park, Tomi Masashima (played by Nakayama) who is helping to work.Samsashima believes that due to the influence of the reduction of birth, the competition for children will become fierce, so he announced that it would carry out reforms and become a kindergarten selected by parents.Decided to introduce English education and programming education.In contrast, experienced conservationist Lin Qianzuko (played by Shima Ise) called for a solution to the shortage of manpower and business efficiency, but Samami refused to listen.Therefore, five nurserymen including Kurita Yomi (played by Yuki Yagi), who had been dissatisfied with the harsh labor environment since the beginning of the past, proposed to resign.

Mabi heard about the situation of Forpeace Nursing Park from Yiping, and thought that % was not a good opportunity, so he invited Yiping to enter the Nursing Park as a nursery volunteer and rebuild the Nursing Park...

Masasuke (played by Shinzo Jun) noticed that Ichihei (played by Kaoru Shingo) used cohabitation in order to participate in the election.Masasuke, who was hit hard, said he would leave Omori's house as soon as possible, but hoped to attend before the birthday of Komari (Matsuda Risa).Because everyone is looking forward to birthdays, I hope to continue to pretend to be a family member before that.

On the other hand, Ichiping deleted the family photos uploaded to SNS, and was criticized by Mabi (Yasa Yasuda) as a villain, and told % to prevent the termination of cohabitation.Ichiping, who was worried about his image being damaged when participating in the election, won over Himeri and Chaoyang (played by Chiba Yujiro) to continue living together.

At this moment, the news program broadcast a special episode of the Children's Canteen initiated by Yiping.The program also introduces Du (Ai Tokunaga) who is responsible for cooking and Sunflower who works as a volunteer.Among them, Himari mentioned the recipe left by her mother Yangna (Xiang Yuka), saying that she wanted her father to eat the meals she made by her mother.Zhengsuke was filled with emotion when he saw this scene.

The next day, Ichihei came to the store in Tokyo and proposed to hold a grand sunflower birthday party in the store. The program received a lot of responses and the appointments were full.In order to continue living with the Masasuke family, Ichiping could not give in.But at this moment, a suspicious figure appeared outside the store...