The best Aoi Nakamura’s romance movies

During her freshman year in high school, Mika Tahara (Yui Aragaki) loses her cellular phone, but later finds it in the school library with the help of an unknown caller. Throughout the summer, Mika and the mysterious caller continue to communicate, and agree to meet each other once school starts again. The caller turns out to be Hiro (Haruma Miura), a delinquent-like boy Mika is initially afraid of, who shows proof of his identity as the caller with a photo of the sky on his cellular phone.

Kanna Seto lost her childhood friend Haruta in a car accident when she was a freshman in high school. Carrying the emotional pain from that incident throughout her life, Kanna is still wounded as an adult. Kanna then meets Roku Akazawa, who also carries a painful experience from his past. When Roku was an elementary school student, a girl who was with him got into an accident and died. Because of that incident, Roku carries a heavy sense of guilt. When they meet, time, frozen since that day, begins to tick again.

Iku (Nana Eikura) joined the Library Defense Force after a member from that team retrieved an important book that was targeted for censorship. She is assigned to work under Atsushi’s (Junichi Okada) team. She endures Atsushi's harsh treatment and looks for the member who retrieved her book. She also finds herself becoming attracted to Atsushi. Iku meets female high school student Marie (Tao Tsuchiya) at the library. Maries has a hearing disability. She is also a childhood friend of Mikihisa (Kei Tanaka). Iku senses Marie’s strong feelings for Mikihisa. Asako (Chiaki Kuriyama) works as a clerk for the Library Task Force. She has frequent meetings with curator Shuji (Aoi Nakamura). This creates complicated feelings for Hikaru (Sota Fukushi). One day, Mikihisa is arrested because of a book he recommended to Marie. Official reason given is because the book is unsuitable for disabled people. The members of the Library Task Force are angered by Mikihisa's arrest.

A mother, daughter and two of their friends live in an old Western-style house in Suginami. As secrets are revealed, they face challenges together.

Set 18 months after movie "Library Wars." After the government's enactment of the Media Betterment Act, battles wage between the Betterment Squads and the Library Defense. The Library Defense resists censorship and advocates freedom of expression. The biggest battle awaits for the Library Defense.