In the near future, the federal government creates a committee to rid society of books it deems unsuitable. The libraries vow to protect their collections, and with the help of local governments, form a military group to defend themselves--the Library Forces!

When the director of the Kanto Library Base gets sick, a temporary replacement is assigned, according to regulations. But Iku and her roommate Asako discover a trail of missing books that leads back to the temporary director. Has he betrayed everything the Library Forces stand for and handed books over to the enemy?!