20 years ago, a promise was made. What type of adults have they become? Did they become who they wanted to be? In 1997, they faced a huge enemy that only young courage could fight against as a weapon; in 2017 they are faced with even more formidable opponents.
Set in the near future, a high school gives priority to privacy protection. The names of teachers and students are not revealed. 21 female high school students are locked in a classroom and their vision is shown all over the world in real time. The only way to escape is to receive many "good" marks from the audience.
Snack bar owner (Eiko Koike) and her regular patron (Arata Furuta) tell 11 different stories about the worst day in the lives of people in their neighborhood of Shimokitazawa, Tokyo. One of those instances involve a Tokyo politician being kidnapped during an S&M session.
During the Sengoku period, the Ii family governs the Totomi region. Due to many past wars, there are no more male successors left to become a lord. Naotora Ii (Kou Shibasaki), the only daughter of the lord, now becomes a lord. She faces a difficult period. The constant love from her fiance, whom she became engaged with at a young age, helps her to keep moving forward.
In 1964, Mineko Yatabe (Kasumi Arimura) was born and then raised at a mountain village in the northwest of Ibaraki Prefecture. She has 7 family members. Her older brother is smart and he is the first person from their village to an university. Her father goes to Tokyo to earn tuition fees for her older brother. Mineko thinks if she graduates from high school, she wants to help her grandfather and mother with farming. Mineko Yatabe's life changes after her father fails to come back.
Nao Miyaji (Yoko Maki) is a housewife with a husband and a son. She doesn't care much about dressing herself up and concentrates on things like making her middle school aged son eat more. Nao Miyaji is satisfied with her life.
One day, Nao Miyaji is scouted as a potential reader model for popular women's fashion magazine Vogue. Since then, her life changes.
Yuji Tomioka (Teppei Arita) is a 38-year-old single man who has never dated a woman. He works the night shift as a security guard at a supermarket. He experiences loneliness during this time. One night, during a shooting star, he wishes to have friend. A mysterious neighbor, Azusa Hada (Tsubasa Honda), appears in front of him. They fall in love, but Yuji's life changes.
Motoko Haraguchi (Emi Takei) works as a temp at a bank. To pay off debt that she inherited from her parents, she also works as a hostess at a club in Ginza. Motoko Haraguchi is finally able to repay the debt.
In 1921, Kenji Miyazawa (Ryohei Suzuki) left a wealthy family and went to Tokyo. Standing on his own two feet, he lived there for 8 months. Late summer, Kenji received a telegram from his family. Worried about his younger sister Toshi, Kenji returned to his family. What waited for Kenji there, was Kenji's father Masajiro. His father had deceived Kenji about the health of his younger sister, because he was worried about Kenji living alone. Meanwhile, Kenji has still not found his true calling in life. Kenji makes korokke (potato croquettes), which he tasted in Tokyo, and shares it with his family. He realizes that sharing his happiness is ideal for him. In accordance with Toshi's wish, Kenji becomes a teacher at a newly created agricultural school.
Film director Shintaro Kambayashi (Mantaro Koichi) begins work on his first movie in 15 years titled “Yakusoku no Hi.” Koichi Kaburagi (Issei Takahashi) is a screenwriter for the movie.
One day, Susumu Tochihara (Mitsunori Isaki), while working at a script printing company, sees the script for “Yakusoku no Hi.” He recognizes screenwriter Koichi Kaburagi's name and feels embarrassed because they attended the same scenario writing class.