Mia Kurihara (Emi Takei) works in the public relations department of a company. She falls in love with Kairi Miyoshi (Hideaki Takizawa). He is the vice president of the company, but he is also married.
"I thought I might be using a lifetime's happiness in a moment. I was that happy and she was that beautiful." A young boy stands on the red earth of Australia under its blue sky. It is 17-year-old Sakutaro Matsumoto. His time with the girl comes back to him. The colored sand runs through his hands and a tear appears on his cheek. He wakes up. It's 2004 and he is 34 years old and in Japan. He thinks "I have been in a world without her for 17 years." Returning home to see his old high school for the last time before it is demolished, Saku confronts anew the loss of the love of his life, Aki, to leukemia 17 years ago. Now a medical researcher at graduate school, he has been living as if half of him died with her since then. Based on the bestselling novel that sold over 3 million copies, the past and present come together in this love story that is both pure and sad.
Kyoko Okitegami (Yui Aragaki) is a private detective. She is known as the Forgetful Private Detective. When she wakes up in the morning, her memory is reset. Due to this, she rigidly adheres to a maintenance secret. No matter what case she has, she has to solve the case in a day. On her body, she has an important note that she must never forget.
Even though Yakusuke Kakushidate (Masaki Okada) has a crush on Kyoko Okitegami, he is alway mistaken as the culprit of a case by Kyoko Okitegami. No matter how close Yakusuke Kakushidate gets to Kyoko Okitegami, she totally forgets about him by the next day.
Yoshikawa Nao stays behind to live by herself when her parents leave to inherit her grandpa's farm in the country. On the day she moves into her new apartment, she discovers that it was rented also to Uehara Hisashi; a cute, super-cool, popular guy from her school. Not only did their housing agency unexpectedly close down, the landlord of the apartment tells them that they had to pay more for their apartment than they had expected. With no money and no home to return to, Nao and Hisashi decide to live together as flatmates.
Story depicts the dreams, friendship and love of young people who move to Tokyo, but struggle to live there.
After Oto Sugihara’s (Kasumi Arimura) mother died, she was raised by her foster parents in a rural village in Hokkaido. Even though she is in a difficult situation with her foster parents pushing her to marry a wealthy older man, she lives brightly and diligently. She supports her foster parents by working at laundry.
Ren Soda (Kengo Kora) was raised by his grandfather in Fukushima. Hoping that someday he will be able to buyback his grandfather's land and they can work together, he moves to Tokyo and works hard at a moving service.
One morning, Ren finds a letter, which seems important, among his friend's stuff. His friend mentions that he stole it in Hokkaido. Ren is unable to ignore the letter, so he drives to Hokkaido to give the letter to the rightful owner. The owner of the letter is Oto Sugihara. Ren is aware she is being pushed to marry an older man and feels sorry for her. He gives her a ride to Tokyo.
Miyabi Tachibana (Miki Nakatani) is 39-years-old and she hasn't had a boyfriend in 5 years. She enjoys her life as a single woman. She is a doctor and runs her own beauty dermatology clinic. Miyabi Tachibana is pretty and confident, but at her school reunion she finds herself being pitied by others for still being single. After the school reunion, she attends a gourmet meeting at a restaurant. There, she talks about her school reunion. At that time, Seiji (Naohito Fujiki), the owner of the restaurant, makes a biting remark that she isn't the type popular with men. She becomes upset by the remark, but she accepts his advice.
It is said that many working women in their twenties are clandestinely, sloppy and lazy homebodies. At work, they put on a facade of living it up in glitz and glamour, but at home, they live as ultimate sexless slobs! Hotaru Amemiya (Haruka Ayase), who works in the interior design industry in Tokyo, is truly one such homebody. She would rather sleep than date and loves to dilly-dally at home, clad in a stained T-shirt and sweat pants, drinking beer while scratching her behind. But her comfy homebody life is threatened when one day, her boss, Takano (Naohito Fujiki), moves into her house out of the blue. Then, at work, an up-and-coming young designer, Makoto Teshima (Kazuki Kato) returns from London, and Hotaru's life takes a new turn. She falls in love! How will the homebody girl respond to Makoto's bold move? Will she remember how to be feminine again?
Natsumi Uemura (Erika Toda) is an English teacher at Meiryo High School. She has always dreamed of being a teacher. Until her middle school days Natsumi lived in the U.S. She is now a first grade home room teacher and advisor to the basketball team. She is bright and has a positive character, so she is popular with the students. Shuji Kashiwagi (Haruma Miura) is a biology teacher at the same high school. Shuji is a 2nd grade home room teacher. Shuji is faithful and considerate. He deals with students with his heart so not only students but also their parents support him completely.
Natsumi and Shuji graduated from the same high school and university. They plan to marry in 3 months. Natsumi's friend and roommate, wedding planner Sayaka Todo (Mariko Shinoda), helps the couple with their wedding plans. All signs point to Natsumi and Shuji being happy.
On the first morning of the new school term, Shuji finds a naked woman sleeping next to him. Shuji thinks back to the prior night and recalls becoming drunk and having sex with the woman. He becomes embarrassed, but gives the unidentified woman a key and leaves for work. Shuji feels guilty to Natsumi and regrets what he did, but tries to calm down and prepare for the new school term.
Students in the 2 grade 1 class like Shuji as their home room teacher. When Shuji calls roll he discovers two students, Hikari Saeki (Emi Takei) and Nozomi Sonoda (Ayame Gouriki) have not yet come to school. At that time, one female student walks into the class room. The girl is Hikari. Shuji tells the students to move to the auditorium for the opening ceremony of the new school term. Hikari stays in the classroom until the rest of the students clear out. Hikari gives something to Shuji. The item is Shuji's apartment key. Shuji realizes the woman he spent with last night is Hikari...
Reiji (Satoshi Ono) is young CEO of a first-class hotel. He is single and 34-years-old. Even though he has a good appearance and wealth, women eventually leave him because of his personality. He is generous with himself, but strict with others. For the first time, Reiji falls in love with someone. Her name is Misaki (Haru). Hoping to gain her love, he begins to change.
Kohei Kamishiro (Masaharu Fukuyama) worked as a musician in his past. He only had one hit song and his recording contract was eventually cancelled. He became devastated and left the field of music.
Twenty years later, Kohei Kamishiro keeps his distance from music, but his passion for music hasn't faded away. He leads a boring life. Due to his past experience, he finds it difficult to have a relationship with women. One day, a woman appears in front of him. She has a complex and because of this leads a solitary life. The woman though has an amazing singing voice. By meeting her, Kohei begins to think he wants to make music again.