Sumi is 65-years-old and still a single woman. When she was younger, she worked at a flower farm and flower shop run by her family. Sumi wanted to go to college, but she had to take care of her grandmother, who got in an accident, and general household affairs. After her grandmother, Sumi also had to take care of her father and mother. Now, Sumi is 65 and she has never had a boyfriend. She is proud that she worked so hard, but now she wishes she could live a new life and become young again.
One day, Sumi wakes up and finds herself with the appearance of a 20-year-old.
The story centers around Ann Kaede (Kana Hanazawa), a picture book writer and her father (Shigemitsu Ogi). Returning from New York, Ann found herself unable to come up with anything to write. To add to her sorrow, her beloved cat, Pero, went missing. She frantically looked for Pero, but what waited for her was something that would change her world. Just what is it?
Yasutake Shingo works as a newspaper reporter but his life is stiffled and lifeless. That changes one day when he meets the irrepressible Matsunaga Chie by accident. Just as their relationship is blossoming however, Chie tells Shingo that she has breast cancer. Shingo determines to marry Chie right away, but she'll have to go through surgery and cancer treatments first. Then, not long after their marriage, Chie becomes pregnant. But that means she could lapse back into cancer again. Still, the couple decides to have the child, a girl they name Hana. But as the years pass and Chie bounces between the cancer and cures, she decides she had better teach Hana to take care of things in her place, just in case the worst happens.
Aoi Miura (Sota Fukushi) was born and grew up in Toyama Prefecture. He has an indecisive personality and does not like summer. He was the focal member of the high school swimming team, but he now works as an assistant at a small architectural office in Tokyo.
One summer day, he meets his childhood friend and first love Akari Serizawa. During their school days they spent everyday hanging out together until the fireworks night in their 3rd year of high school. That night, Akari suddenly disappeared. Now, Akari has a man named Aoi.
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.
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?