Saya Kisaragi is a high school girl living with her father in a temple, her life keeping everything in order and attending school changes one day, when he reveals that she has the skill to take down devils that attack humans. Armed with a katana she goes on devil-hunting every night.
As the story goes she has memories of soemthing that happened to her before these events but she can't remember what it was. Saya behaves like a fool by day but at night she's another person, maybe she's a vampire and the night gives her power, but most of the time her behavior can be irritating acting like a silly. At the end of the serie we know the reasons why the town is full of devils and who's behind this plot.
The only good thing about this serie is the design and the animation the rest is better to... forget.
