Venus Versus Virus summary: Venus Versus Virus revolves around the life of the young girls named Sumire Takahana and Lucia Nahashi, who met as Sumire mysteriously discovered Lucia's secrets at the Venus Vanguard, a group who hunts demons called "Virus" led by Lucia's adopted father Nahashi. Now, while accepting jobs from people who find the Venus Vanguard brochure, they fight off the “Virus” while seeking their true roots and motives, and for that, Lucia finds that Sumire can be a lot more useful than she seems.