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.

There are Tomoki, Shun, Kazuya, and Aita in Oiso, the seaside town. One day, Tomoki finds their teacher, Ito, who is their teacher and Kajya’s uncle, dead.

The movie is about the endless miracles during the motorcycle trip of Dan, Tettsu, and Chiharu, the Sannō Rengōkai trio (also known as DTC).

Members of SWORD win against Wangan Rengogun, which is led by Kohaku. The city becomes peaceful again. Nevertheless, the most brutal gangs, Doubt and Prison Gang, appear. They try to dominate the area controlled by SWORD.

An anime otaku named Sakamichi Onoda has just entered high school. In middle school, he did not have any friends with similar interests, but now he is hoping to find similar people at his new school's anime club.