Jun Jonochi (Mirei Kiritani) works at a paper manufacturing company. She is earnest, but clueless about her own appearance. She doesn't have any interest in making herself look good. One day, she realizes that people don't view her as other women. She begins to read up on things like make-up and fashion trends with her two female colleagues.
Hatoko (Mikako Tabe) goes back to her hometown of Kamakura for the first time in 8 years. She has inherited her grandmother's store "Tsubaki Stationery Store." The store actually functions to write beautiful letters on behalf of its clients. At first, Hatoko, being new to the business, seems like a rookie, but she begins to display her talent for writing letters. She gets more requests.
Azusa (Anna Ishii) and Narumi (Fuka Koshiba) are 2nd grade high school students. They lack confidence and also any kind of ambitions. Hazuki (Karin Ono), Tamaki (Mika Akizuki) and Mika (Miku Uehara) are also unnoticed students at the same high school. These five girls form a dance club and begin to dance to get credits. They soon learn the joys of dancing and also learn to express themselves.
Yuka Shima (Mayu Matsuoka) works as an OL at a large general trading company. Suddenly, she is transferred from her office to an aquarium that is affiliated with her company. She now works as a keeper at the aquarium and her senior is Kaji (Kenta Kiritani). Yuka Shima struggles with her new job and marine animals, but with her bright personality she is able to grow as an aquarium keeper.
30-year-old Rinko Kamata (Yuriko Yoshitaka) works as an unpopular screenwriter. She doesn't have a boyfriend, but she has two female friends Kaori and Koyuki. They meet regularly at a bar. There, they complain about their situations and go through what if scenarios. One day, Rinko Kamata decides to go for happiness at love and work.
Set along the Shimanto River in Kochi Prefecture, Japan. "Osozaki no Himawari" depicts the lives of seven people who follow vague dreams, but live an ordinary life.
Jotaro Kodaira (Toma Ikuta) is about to turn 30-years-old. Jotaro has recently been laid off from work and around the same time his girlfriend of seven years dumps him. Jotaro then spots a website recruiting people for work in Koichi Prefecture in a regional revival cooperation.
Kahori Nikaido (Yoko Maki) is clinician sent to work in her hometown of Koichi Prefecture. On the way to there, Kahori meets Jotaro Kodaira.
Kotoha Ninomiya (Manami Higa) works in the general affairs department at a confectionery company. Suddenly, she receives an order to transfer to the public relations department. She has a hard time there. Making things worse, Kotoha Ninomiya learns that Atsushi Imagawa (Dai Watanabe), whom she holds secret feelings for, is about to marry another woman. They have been friends since they were young. Heart broken, she attends Atsushi’s wedding ceremony. At the ceremony, she is moved by Kumi Kuon’s (Kyoko Hasegawa) congratulatory speech. Kotoha Ninomiya is a legendary speech writer.
Shinichi Sakurai (Sadao Abe) is married to Kanako (Kyoko Fukada) and they have a daughter named Kaori (Mikuu Yamada). Both, Shinichi and Kanako received only a middle school level education. Even though they don't have much money, they are a happy family. At work though, Shinichi experiences effects of only having a middle school education.
One day, Shinichi sees Kaori’s poor score for a national test. He freaks out and decides to improve Kaori's education. Thus, 41-year-old Shinichi begins studying with Kaori and instructs her for the upcoming middle school entrance exam.
Mikuri Moriyama (Yui Aragaki) is 25 years old. She doesn't have a boyfriend and doesn't have a job even though she holds a graduate degree. Everyday, Mikuri Moriyama has a feeling that she is not needed. Her father, unable to see her suffering anymore, arranges for her to work as a housekeeper. Her employer is 36 year old Hiramasa Tsuzaki. He is single and works for a company. A series of events leads them to marry as a working condition.
Kazuya Takajo (Sho Sakurai) was a promising soccer player. At the age of 23, he was selected for the national A football team and he bought a house to live with his fiancé Miki Nakagawa (Masami Nagasawa). One day, Kazuya Takajo gets into a car accident and becomes paralyzed. He must now spend the rest of his life in a wheelchair. He falls into deep despair. At that time, Miki shows him their marriage certificate.
Kazuya goes through rehab on the strength of his wife's love. Yet, he becomes frustrated by those opposed to his marriage with Miki and others who give him pity looks. He also can't find anything to replace soccer in his life. Kazuya then witnesses a wheelchair basketball game at a gym.