Takahara Sumire - chan - ordinary Japanese schoolgirl... But this is only in appearance! In fact - it is a very rare kind of anti- virus, which fights the virus - demons, devouring the souls of any innocent and unsuspecting people. The very Sumire their work is not pleased,I would like her to live a normal peaceful life, but only in her case it is simply impossible. Yet, it is not fighting alone. Helps her antique shop owner Lucia -san and family Nahas. What awaits this company?