After going through a harsh test, Kasahara Yu (Nana Eikura) gradually grew into an excellent member of the library team task force. After the Odawara Library Guard Battle, she seemed to finally discover that the prince who had been thinking about her for many years was the instructor Tang Shangdu (Junichi Okada) who often had a stinky face. One day, Yu's parents came to visit unexpectedly, and she was in a mess because she never told them her real job. Nakazawa Meijiang (Tao Tsuchiya), a girl who lost her hearing due to illness, has been secretly in love with Xiaomu Kanjiu (Kei Tanaka) who is like an older brother for many years, but Xiaomu was arrested by the improvement team for accusing him of spreading books that are harmful to the physical and mental health of the disabled. On the other hand, a museum researcher named Asahina Shuji (Aoi Nakamura) approaches Shibasaki Mako (Chiaki Kuriyama), and there is another intention behind his kind smile. Tezuka Hikaru (Sota Fukushi) received mysterious calls one after another, and the caller holds the future fate of the library team... This film is adapted from the original work of Hiroshi Arikawa.