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Following the world's greatest catastrophe, which nearly led to the apocalypse, the revelation of the ability to utilize magic was brought to light. With the globe entering a new era, an Academy specializing and entirely for ability users was established. At the academy, abilities are evaluated and ranked based on how they influence the world. Gleren, an F-rank student, covertly works for an organization that preserves global harmony and balance. A peace lover who would rather watch anime and play games than to do anything bothersome. But one day, with the arrival of Maria, the vampire princess, his peaceful life came crashing down. Maria the Last Vampire is a special existence for which she was constantly sought after. With danger always lurking about the Vampire Princess, Gleren Stasis—the F-ranked student at Saint Stella Academy—was tasked with protecting her at all costs without disclosing the truth about himself.