"We've been expecting you at Venus Vangard," the receptionist greeted.
Sumire Takahana appears to be an ordinary schoolgirl, but she possesses the unfortunate ability to perceive malicious spirits named "Viruses." After encountering Lucia Nahashia, a gothic lolita monster slayer for hire, Sumire's life takes a significant turn. Refusing to remain passive while the Viruses attack the vulnerable, Sumire teams up with the enigmatic Lucia, who sports an eye patch, to track down the Viruses and avert harm to innocent individuals.