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.
Yui Hayakawa (Yuina Kuroshima) is a 16-year-old high school student. The one area that she has talent is that she can run fast. One day, Yui Hayakawa travels through time and finds herself in the Sengoku period. To protect young lord Tadakiyo Hagi (Kentaro), Yui Hayakawa runs on the battlefield.
Set in the late Meiji period (Meiji period: 1868-1912).
Ten Fujioka's (Wakana Aoi) family has run a drug wholesale store for generations in Kyoto. She laughs a lot, but, due to her laugh, important business talk flounders. Her father, Gihee (Kenichi Endo), tells her not to laugh. One day, she meets a man Tokichi Kitamura (Tori Matsuzaka) who is chased by a bunch of men. Since then, Ten’s life changes.
Takashi Honami (Yutaka Takenouchi) is an associate professor in mathematics. He has a problem talking with others. His wife Nao (Mimura) becomes fed up with him and takes their child and leaves him. His boss at the university tells him to take a speech class, but Takashi Honami encounters trouble with his instructor Kyoko Ezaki (Kumiko Aso). A few days later, he meets Kyoko Ezaki again at an unexpected place.
To solve the country's low birthrate problem, the Japanese government set up Otona Koukou (Adult High School). Adults over 30 and have no sexual experience are forcibly enrolled into Otona Koukou by the government.
Eito Arakawa (Haruma Miura) is a 30-year-old single man. He graduated from a prestigious university and works at a bank. He has received recognition for his work there. He is also physically attractive, but he has never had sex.
One day, he receives an entrance guide to Otona Koukou.
Jiro (Sho Aoyagi) and Mifuyu (Riko Narumi) are a couple who just started dating. One day, they argue about how to eat the yolk of a fried egg. Jiro is stubborn about how to eat and he has a hard time dealing with people who eat differently. This causes Jiro to reflect deeply on his relationship with others including Mifuyu. He opens up to the different ways people eat and the different thoughts of others
Isao Komori is a college dropout who spends his days cooped up in his apartment playing video games. The highlight of his day is visiting a convenience store where an angel-like high-school girl called Mari visits every night.
One morning Komori wakes up in Mari's body. Another "Komori" inhabits his old body, and Mari has disappeared. Komori struggles to maintain Mari's ordinary life and starts to investigate Mari's disappearance.
In Tokyo, Mika (Shizuka Ishibashi) works as a nurse during the day and at night serves beer at a girly bar. One evening, she meets Shinji (Sosuke Ikematsu) who works as a day laborer. They become attracted to each other.