Takatoshi Minamiyama (Sota Fukushi) majors in art at an university in Kyoto. On the train to the school, he sees Emi Fukuju (Nana Komatsu) and falls in love with her at first sight. Gathering up all his courage, he speaks to her. They begin to date and enjoy happy days together, but Emi reveals her secret to him.
Yuzuko Nanakusa (Koyuki) was betrayed by her husband. She now raises her son and daughter as a single mom, in addition to working at a company. One day, the company she works for goes bankrupt suddenly. She loses her salary and savings. While not knowing what to do next, Yuzuko Nanakusa is contacted by attorney Shinichi Kakihara (Atsushi Ito). They went to the same high school together.
Shinichi Kakihara tells Yuzuko Nanakusa that there is a something more to her company's bankruptcy. To protect the life of her two children, she attempts to reveal a big evil.
Drama series reveals why Setoka (Tao Tsuchiya) was rejected 12 times, her fateful meeting with Chiaki (Takuya Kusakawa), meeting her first love Takane (Yudai Chiba) and her school days with her classmates Kunimitsu (Yosuke Sugino) and Chiyuki (Ito Ono).
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.
A love between high school students Naoki (Kanta Sato) and Kotoko (Reina Visa). Naoki is handsome, good at sports and smart. Even though Kotoko is not very smart, she has a bright personality and strong will.
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.
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.