During the Shoka era (starting in 1989), in order to improve the chaotic and decadent social atmosphere, the Japanese government promulgated the "Media Improvement Law" and established a special department to seal and destroy all books that may affect the physical and mental health of the world. But at the same time, freedom of speech was also brutally curbed and suppressed. In order to defend free thought, an organization called the "Library Self-Defense Organization Book Team" came into being. They took up arms to protect books, and many people sacrificed their lives for this. With the help of the library team members who were once regarded as "Princes" in high school, the passionate girl Kasahara Yu (played by Eikura Nana) decided to join the library team, but the second-class library Zhengtang Shangdu (played by Okada Junichi) who was responsible for training her seemed to always deliberately make things difficult for Kasahara, and the girl still relied on her own efforts to become a member of the special library team. In the following days, Kasahara and the instructor Tang Shang and the same period Tezuka Hikaru (played by Fukushi Sota) The friendship and trust deepened. Before long, a major event concerning freedom of speech arrived, and the fateful war between the library team and the media improvement team kicked off ... This film is adapted from the first part of Hiroshi Arikawa's "Library Series".