Tokyo, Winter. Despite the use of the Youth Ordinance Bill to enforce curfews for minors and regulate the use of the Internet, young people continue to fight for their own freedom through underground methods. One such group calls themselves Surat. They have decided to take on Fumito Nanahara, a man who has great influence on the political world, and basically controls Tokyo with an iron fist. While using the Internet as a weapon to discover more information about Fumito, they learn about "Tower", the secret organization behind Fumito which engages in human experimentation. When members of Surat attempt to set up an ambush in the subway to expose the truth behind "Tower", mysterious creatures suddenly appear and attack the passengers. During this crisis, Saya appears - a young girl who uses a Japanese blade to slay the Old Ones. The same Saya who lost everything dear to her in that horrifying incident in Ukishima Province. What sort of "experiment" is Fumito and "Tower" trying to ... Written by ANN

2112; the summer before Akane Tsunemori was assigned to Division One of the Public Safety Bureau's Criminal Investigation Department. Teppei Sugo, an accomplished pilot of the Defense Army's 15th Integrated Task Force, joins the military operation in Okinawa. Three months later, an unmanned combat drone opens fire on the Ministry of Defense in Tokyo. Enforcer Tomomi Masaoka of CID Division One is dispatched to Sugo's military base to investigate the truth behind this case.