Natsuki Tsukioka (Ren Meguro) broke up with Yayoi Momose (Kasumi Arimura), whom she had been dating for more than three years, and decided to live with her daughter Minami Unkai (Sena Izumiya).In the evening, Tsukioka Natsu used the computer to search for information related to “Single Parenting”, picked up a pen and took notes, and saw the name column in the notebook.When writing “Nayun”, he stopped.He thought about what he should do next.

Tsukioka Natsu went to an izakaya with Fujii (Ayumi Nakajima), a senior in the company, and told him that he had a daughter and decided to live with her alone.Fujii shared his very hard experience of coaxing the children to eat and sleep while his wife was hospitalized.Natsuki Tsukioka said that she had made up her mind and even considered changing her job in order to prevent Hai from transferring to another school.But Fujii told him:“ If parents collapse due to stress, it will be a secondary injury to the children.”

Tsukioka Natsu went to Odawara's elementary school to pick up Kai.As the two walked, they talked about the life of Hai's mother, Sui Ji (Furukawa Kotone).Tsukioka Natsumi asked: “...What do you think about transferring to another school?”Hai immediately replied: “No.”“Mom is gone, many things have changed in Hai?But must the sea change?Why?”Faced with Hai's question, Tsukioka Natsu was speechless...