At present, over 47% of the male population in Japan aged between 30 ~ 34 are single. While for women, the no. goes up to 60% for those in their late twenties. It is not that they are unable to get married. Rather, they all choose to remain single, as they believe that marriage is not the be all and end all. Life holds more promising things beyond marriage, and thus they are all celebrating life as a single. This drama takes a look at life from the perspectives of these men and women. Hoshino Mamoru is the President of a film production company, having taken over the position from his father. He is an excellent creative director, but he detests chaos and hence prefers to remain single. His brother, Susumu, works at the same company, taking care of the business side of things. Currently undergoing divorce proceedings, Susumu has had to move out of his marital home. Haruno Yuki is disillusioned with men, after having gone through several failed relationships. She wasn't making great strides in her career either, and so one day, she decided to quit her job and pursue her dream of becoming a scriptwriter. In order to pay the bills, she takes on a part-time job at a maid agency. Before she knows it, she gets her chance to make her dream come true! It could be Fate, or just plain coincidence, but the 3 of them are plunged into each other's lives; The "Affluent Single", the "Divorced Hero" and the "Marriage Refugee". Will a pivotal moment happen upon them? Will the "Affluent Single" decide to give wedded bliss a chance?

The story centers on Kakeru Nishizawa and Mami Sakaniwa, two people who find each other through a dating app, and decide soon after to get engaged. After their engagement, Mami suddenly disappears. In trying to find her, Kakeru must confront a side of Mami's past that he might not have wanted to know.

When Kanako accidentally applies to work at an assassination agency, the timid office worker discovers that she has a knack for bumping people off. Will she ever earn the respect of Sakurai, her prickly and kinda hot co-worker–and why is she still having silly workplace problems when she’s employed with hitmen?!

Yuichi Sugawara is a freelancer, who spends his days meaninglessly. He lives with his long-term girlfriend Satomi Suzuki. One day, they start to argue over a trivial matter which causes Yuichi to leave their home. He wanders around and meets with his friends, sister, and mother. When he starts to feel uncomfortable around them, he leaves them behind. He then crosses paths with his father, Koji, for the first time in ten years. Koji also ran away from his family, including Yuichi, at that time. Koji then invites Yuichi to come over to his house. Hen accepts and turns off his smartphone to cut off all the relationships he has.

Saburo is a high school student good in sports, but not very good with his studies. One day, Saburo travels back in time and arrives in the Sengoku period of 1549. There, Saburo meets Nobunaga Oda who looks and sounds just like Saburo. Nobunaga Oda is the son of a warlord and magistrate of the lower Owari Province. Nobunaga Oda though is physically weak and he asks Saburo to take his place. Then, Saburo as Nobunaga Oda attempts to unify the country of Japan.