This drama tells the story of Natsuki Tsukioka who dated her classmate Nagumo Suiki during her college days, but one day when she was applying for a job, Suiki suddenly broke up.Seven years later, Xia learned about Shui Ji's death from a friend in college.Xia, who had never seen each other after being broken up and had no real sense of the fact, went to the funeral, where he met a little girl named Hai. Xia couldn't hide his surprise when he learned that she was Shui Ji's daughter.Then, Shui Ji's mother told him that he was Hai's father.Shui Ji gave birth to a child in a place unknown to Xia and raised her without saying anything. Xia thought about the seven years Shui Ji and Hai spent...

Natsuki Tsukioka (Ren Meguro), who works in a Tokyo printing company, has a girlfriend Yayoi Momose (Kasumi Arimura) who works in a cosmetics company.Although both of them are ordinary, they live a happy life every day.One day, when Natsu Tsukioka was discussing summer vacation arrangements in her apartment, Natsu's cell phone rang.After Tsukioka Natsu answered the phone, her expression was stiff.

The next morning, Tsukioka Natsu hurried back to his hometown.Father Kazuya, mother Sachiko, and brother Yamato (Kido Daishon) were having breakfast when they were startled by Tsukioka Natsu's sudden arrival.

Tsukioka Natsu took out the mourning clothes from his room, and Kazuya handed him the black tie.

Tsukioka Natsuki (Ren Meguro) learned from Mizutoshi's mother Akane (Otake Shinobi) at the funeral of her ex-girlfriend Nagumo Suiki (Furukawa Kotone) from her college days that Umi (Izumiya Sena) was her daughter.One day later, Hai found Xia's apartment alone.Tsukioka Natsu was very surprised, and asked: Natsu, when will you start to be my father?

Tsukioka Natsu can't answer this question well yet.Xia thought that Hai had to go home no matter what today, so he contacted Zhu Yin and asked her to pick Hai up.

Facing Hai playing happily in the room, Natsu felt at a loss. At this time, his girlfriend Yayoi Momose (Kasumi Arimura) called.Yayoi came to the apartment after a while and was a little surprised to see the sea, but she still wanted to play with her before Akane took her home.

In the apartment at night, Yayoi asks about Natsu and Hai's relationship.In this regard, Xia frankly told Yayoi that Hai was his daughter. This fact was only known at Shui Ji's funeral.After hearing this, Yayoi felt very complicated. Xia replied that she wanted to think about the sea...

Natsuki Tsukioka (Ren Meguro) told her girlfriend Yayoi Momose (Kasumi Arimura) that she had a daughter.He also talked about what happened when he broke up with Nagumo Suiki (Furukawa Kotone). Although he didn't know that she gave birth to Umi (Izumiya Sena), he knew that she was pregnant and thought she had an abortion.After hearing this, Yayoi recalled her past.That is the past that cannot be told to Xia.Yayoi kept this memory in her heart and told Xia that if Xia wanted to be a father, she would be her mother.

Tsukioka Natsu comes to Nanyun's house, where she reunites with Hai.

Hai was so happy that after playing for a while, he was exhausted and fell asleep.Akane (Otake Ninja) said that Kai would be happy if you were still there when Kai woke up, and suggested that Tsukioka Natsu have dinner here.Tsukioka Natsu helps prepare dinner, and Akane tells her story about giving birth to Mizutoshi.

Mother Sachiko (Naomi Nishida) received a call from Natsu and told Kazuya (Taifumi Hayashi) and Yamato (Daisheng Kido) that Natsu had something to say to the whole family.The Tsukioka family thought it was going to announce his marriage to Yayoi, and the whole family was very happy.

On the other hand, Natsu wanted to spend the holiday with Hai and brought Yayoi to Nagumo's house.Seeing Yayoi coming with her, Akane had complicated thoughts.Out of Hai's wishes, the three of them came to the library where Shui Ji worked, where they met Tsuno (Sosuke Ikematsu)...

Natsuki Tsukioka (Ren Meguro) said to Umi (Sena Izumiya) who was still energetic after her mother's death: "There is no need to pretend to be energetic" and let her vent her sadness.

Overflowing with emotion, Hai hugged Xia tightly and kept crying. It was the first time for Xia to hug Hai like this and cry quietly.Momose Yayoi (Arimura Kasumi) watched with mixed emotions.

At the beach, Hai told Xia: “You don't need to be my dad”.“But don't disappear.After listening to Hai's true words, Xia replied that although he could not replace Shui Ji, he could be with you.Akane (Otake Shinobi) and Shohei (Ri Shigego) looked at the two people from a distance, missing their dead daughter, ”If Sui Ji was still alive...% they said with tears in their eyes.

After that, Natsu went to Yayoi's apartment.Natsu told Yayoi that he decided to stay with Hai as much as possible.In contrast, Yayoi asked Xia Tian, ​​"Do you want to be the father of the sea?"Yayoi wants Natsu to come to a conclusion, and Natsu feels restless.Xia didn't understand why Yayoi was so anxious. Yayoi wanted to tell Xia about her past...

Natsuki Tsukioka (Ren Meguro) said that she could take a week off for summer vacation. Nagumo Akane (Otake Shinobi) suggested that she stay at Nagumo's house for a week and see how it goes with Kai (Sena Izumiya).Hai was very happy when he heard that Xia was coming to live, and told Xia that he could stay as long as he wanted!“Zhu Yin said that she wanted to say hello to Xia's parents.In fact, Xia hasn't told her family about Hai yet, so she is a little speechless.Zhu Yin sighed and urged Xia to hurry up and say it”.Seeing Xia's defensive look and Zhu Yin's endless preaching, Hai smiled and said “like a mother”.

In order to tell his family about Hai, Xia returned to his hometown.However, those who came to greet Natsu were her mother, Yukiko Tsukioka (Nomi Nishida), her father, Kazuya (Taifumi Hayashi), and her younger brother, Yamato (Kido).Great Sage) three people.The table was filled with carefully prepared dishes. In the atmosphere of celebration, Xia told them that he had a daughter, and that daughter was not Yayoi's child...

Taking advantage of the summer vacation, Natsuki Tsukioka (Ren Meguro) went to Nagumo's house to spend a week with Kai (Sena Izumigu), Akane (Shinobu Otake), and Shohei (Go Toshige).

On the first morning, when she opened her eyes, she saw Hai sleeping soundly. Looking back, Xia jumped up in surprise.It was Shohei who was waking them up.Finally Hai opened her eyes drowsily.

After breakfast, Xia confidently wanted to tie Hai's hair, but Hai said it would be fine as long as it was braided in!%Although she practiced the three-strand braid she learned from Momose Yayoi (Kasumi Arimura), Natsu was troubled by not knowing the method.Zhu Yin smiled and said that Xia only practiced three-strand braids.

Afterwards, Xia Hehai went to the apartment where Qianhai Hemizu (Furukawa Kotone) lived.Although the room had been cleared by the landlord, I was able to enter the room under the arrangement of the landlord.Looking around the small single room, Xia couldn't help but think of the lives of Shui Ji and Hai.

Natsuki Tsukioka (Ren Meguro) and Umi (Sena Izumiya) go to the apartment of Momose Yayoi (Kasumi Arimura).After arriving, Xia hugged Hai from behind while he was washing his hands at the sink.Yayoi smiled when she saw the appearance of the two of them.

Yayoi took out the prepared croquettes from the refrigerator and started making them.Seeing this scene, Hai said in surprise: Can croquettes be made at home?“Umi's mother, Mizuuki (Furukawa Kotone), would only buy boxed croquettes when they were on sale in supermarkets.After hearing this story, Xia remembered Shui Ji and Hai's past lives, and told Hai that making croquettes at home was very troublesome.

After eating the croquettes made by Yayoi, Hai said gratefully: "It's just like the ones in the supermarket!"tasty!”Afterwards, Natsu left his seat, and Yayoi asked how Hai and Natsu were getting along alone.Hai replied that she was very happy, and then said: Sorry, I have Xia all to myself. Yayoi jokingly said that there are times when she likes but can't see each other often. Hai asked her if she had also been in this situation with Shui Ji.Umi then asks why Yayoi Natsu and Minato separated.

At the same time, at Nan Yun's house, everyone was discussing the forty-nine-day rituals of Shui Ji and the issue of collecting bones.Zhu Yin (Otake Ninja) called Tsuno, hoping that he could come to see Mizuno after he sorted out his mood.Tsuno was silent after hearing this...

After spending a week at Nagumo's house, Natsuki Tsukioka (Ren Meguro) left with a farewell from Akane (Shinobu Otake), Shohei (Go Rishige) and Umi (Sena Izumiya).After walking for a while, Xia looked back and saw Hai chasing him and waving goodbye.The two smiled and waved to each other.On the way home, Xia went to Nitta Yoshihiko's (Yamazaki Shunori) photography store to pick up photos, and at the same time took two new films to develop.Nitta was surprised that Xia had new films so quickly, and Xia vaguely replied that it was because he had just returned from a trip.After returning home, Xia lay on the bed and looked at the photos.Seeing Haixin's smiling face, Xia felt relieved, but gradually, her longing became stronger.

The next day, Xia called someone during a break at work.After the call was connected, the other party made no sound.“Sorry to bother you, I asked your mother for your contact information. ”The other party responded: “Is it Xia?”After confirmation, the other party continued in a calm voice: “Oh, are you okay?”

In the evening, Natsu went to the supermarket with Momose Yayoi (Kasumi Arimura).Yayoi was very happy to hear Xia say "I'm cooking today", but soon realized that Xia wanted to cook because she missed Hai.Natsu always mentions the sea, which makes Yayoi feel complicated.The next day, Zhu Yin combed Hai's hair.Zhu Yin muttered: “Why should Lian Hai be brought along?”Xiangping replied: “Probably because of nervousness.”

Xia brought Hai into the coffee shop.Looking back, I saw a man looking for someone.Natsume met the male's gaze.“Oh, you're here, ”the male said as he came closer.That man is Natsu's biological father - Mizoe Motoharu (Tetsuji Tanaka)...

Natsuki Tsukioka (Ren Meguro), Yayoi Momose (Kasumi Arimura), and Minami Unkai (Sena Izumiya) went to the shopping mall together.Hai took Yayoi's hand and said excitedly: “Let's go!”Although Yayoi was smiling and behaving cheerfully, Tsukioka Natsu felt something strange in Yayoi's expression.

In the children's clothing store, Yayoi and Natsuki Tsukioka choose clothes for Umi.When Hai entered the fitting room alone, the clerk said to Yayoi: “Please come in with your mother.” Yayoi didn't know how to answer for a moment and was stunned.

Hai smiled and said to Yayoi: “ Yayoi looks just like her mother.”Yayoi asked Hai: “If I really became a mother, would you be happy?”Hai Yuanqi replied: “Yeah!”On the way back to Nagumo's house, Natsu asked Yayoi what her plans were for the relationship between the three of them.Facing the vague Yayoi, Natsu said that Yayoi seemed to be in pain when the three of them were together.Yayoi tried to fool around with a perfunctory smile.However, Xia asked Yayoi directly: “Do you want to break up?”'s opening statement….

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...

Natsuki Tsukioka (Ren Meguro) is tidying up the rooms in her apartment in order to live with her daughter Minami Unkai (Sena Izumiya).Yamato, the younger brother who came to help, said to Xia: If you have any difficulties, just call me.“Xia said:”Two people work hard together.“Yamato felt uneasy about this sentence.

On the other hand, a farewell party for Umi was held in the elementary school class, and Umi was bid farewell by class teacher Nogi Natsumi (Kajun Tani) and her classmates with applause.When returning home, Umi, who was with Natsumi and the two, asked her former mother, Mizusuki (Furukawa Kotone), what she had said to her.So Natsumi told Hai”you always say Xiaohai is the most important“, and Hai smiled slightly.

Every day, Hai, Akane (Otake Shinobu), and Shohei (Ri Shigegang) come to Summer Apartment.”Excuse me!“Xiang Ping said to Dahai:”I will be back from today.%Xiangping and Zhuyin hugged Dahai tightly, reluctant to say goodbye to Dahai.Seeing that look, Mr. Xia felt a sense of guilt...

Tsukioka Natsu (played by Ren Meguro) woke up not in bed, but in a quilt spread on the floor.Umi (Sena Izumiya)'s schoolbag and stuffed animals came into view, but there was no sign of Umi.“…Xiaohai.”I called out, but there was no response. There was silence in the room.

At this time, Kai who woke up at Nagumo's house just woke up and came to the living room, calling “Natsu-kun...”, but there were only Akane (Otake Shinobi) and Shohei (Rishige Tsuyoshi) there, and Natsu was not there.Zhu Yin said:“ Didn't you say you wouldn't go back?” Hai was speechless.

Akane and Shohei said to Hai, who was lying on the bed in pajamas, "Let's have breakfast."“ Danhai said:” I don’t want to eat it.“Zhu Yin was holding the rice ball in the kitchen, handed it to Dahai and said: ”I can't do it without eating, because I have to survive.%Then, he talked about eating rice balls on the day Shui Ji died.

Soon, Xia's mobile phone received a call from Yayoi (Kasumi Arimura).Natsu answered the phone and Yayoi told Natsu Hai that she had something to tell him….

Summer 2021.Nagumo Suiji (Furukawa Kotone) and 4-year-old Hai (Izumiya Tsukina) live in a small apartment.Television news programs have been covering the Tokyo Olympics for days.In the morning, Mizuuki, who works as a librarian, discovered Tsuno Seimei (Sosuke Ikematsu) in the parking lot near the entrance of the library.In order to keep up with the time, Shui Ji deliberately untied the laces of his sneakers, squatted on the spot and tied them again.Tsuno noticed Mizuki's presence and called out “morning”, and the two walked into the library together.

During the lunch break, Suiji was resting alone in the lounge, and Tsuno came to him.“...Nanyun, ”he called out, “is there anywhere you want to go? ”he continued.So Mizuno was surprised by Tsuno's proposal for the two of them to go out together, but he confessed: “I don't want to like Mr. Tsuno.”.