21st Century Girl is an omnibus feature that is of the girls, by the girls and for the girls. The work of 15 women directors under the age of 30, each of whom contributed an 8-minute film, the package highlights a range of genres, visions and thematic concerns.

College student Asako falls in love at first sight with Baku after meeting at a photography exhibit. Romance sparks between the two but doesn't last long when Baku suddenly disappears from her life. Two years later, she spots a man that bears a striking resemblance to him. Even though it is only his physical similarities to Baku that attracted her to him, she doesn't say so and starts dating the soft-spoken young man called Ryohei.

Wakana is a 17-year-old high school student who loves to cook. She enjoys peaceful days with her family and friends, but sometimes she senses delicate changes among people around her. Wakana meets office worker Mizuho through social media where she can talk about her worries, but Mizuho turns out to be a person Wakana never expected to be.

Ayami Kawaguchi is a 17-year-old high school student. Her family runs a tofu shop where the tofu is made with local spring water. She is a member of her high school's kyudo club, but she doesn't do well there. One day, Ayami delivers tofu to a local sake brewery. There, she finds the owner of the sake brewery, Shozo Sugita, collapsed and he is sent to hospital. Afterwards, Ayami Kawaguchi gets involved in a dispute over the water source succession.

A drama in which Yasuko Sawaguchi starred in the movie for the first time in nine years since "Autumn Autumn" and played an elementary school teacher who loves children. Tomoyo Miki became a third-grade class teacher at the transferred elementary school. Children with a variety of circumstances, such as children with a "situation mood disorder" that cannot speak at all at school, and children with a lot of troubled behaviors who have a poor life due to the debt of their divorced mother and father. Tomoyo, in cooperation with his classmates and parents, face each other with all his might. The original is a novel of the same name by Fumiko Shibakaki who has experience as a primary school teacher. Sawaguchi plays the role of Tomoyo Miki, a female teacher of the main character, and Yuhiro Murata, Kumiko Endo, Yuriko Hoshi and others set aside.