Saya Otonashi, a seemingly normal high school student, suffers from amnesia and she can't remember the past year of her life. One day, after a man appears and gives her a katana sword, her destiny begins to be revealed. 
 
Soon she finds herself fighting the latest threat to humanity - Chiropteran monsters, ravenous immortal creatures that can change their form, disguising themselves as human beings. They feed off blood and hide themselves within the human world. An organization known as the Red Shield has been waging a private war to wipe them out and now the struggle has grown. Saya's journey for the truth has begun. 
 
(Source: Sony Pictures Home Entertainment)

Teropterids are evil beasts which pose as humans and live only to drink human blood. Fortunately for the human world there are groups dedicated to destroying them. A brooding and mysterious girl named Saya is the best teropterid slayer there is, and now, in 1960's Japan, she is sent to a U. S. army base which may be infested... 
(Source: Anime News Network)

Saya is a seemingly normal girl living with her father in a shrine. During the day she goes to school and spends time with her friends at a local cafe. But when night falls Saya is called upon to protect her village from strange monsters. 
(Source: Anime News Network)

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 SIRRUT. 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 conduct using the Old Ones? And can Saya finally deliver vengeance to Fumito? 
Now, the final battle begins... 
(Source: Official site)

Saya, the main character, lost her memory and has been living with her adopted family. Her everyday life seems quite normal, except that she eats a lot more than she actually needs. Then one day she meets a guy named Hagi in a park. She is told that he has been searching for her, for a long time. Since then, her normal life has changed completely. (This manga series is proceeding quite a bit differently from the anime) 
A high school girl named Saya can not remember anything from her past. A handsome young man, Hagi, appears and something seems familiar about him. This girl is more than human with an ancient and mysterious past. She will hunt down and kill the monsters called Chiropterans.

It is the official novel adaptation of the anime series. It expands on the events of the anime and gives greater background information on the battle against chiropterans.

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