The Demon Imperial Army and Vampire Nobles have been at war since the cataclysm that happened four years ago. Asuna Suzuki, a girl with a big attitude, has been in the care of the Imperial Army since eleven. She often finds herself distant from others and doesn't interact much but things change once she faces Crowley Eusford on the battlefield during a mission. After that encounter, things begin to change and become much more complicated and start to take an interesting turn.