Olivia is a sixteen-year-old Vestal Virgin, a happy devotee of her beloved goddess Vesta in her home nation of Parcae. But when her faith in Vesta is shaken, Olivia illegally experiments with her own divine power, making a discovery that could save her country from war - if she's brave enough to share it.
After an accidental revelation proves Vesta is fake, Olivia and her fellow Virgins are tempted by a charismatic academy boy, Cassius, to invoke the real gods. Although they risk death if they are discovered, Olivia and her friends test their skills in secret experiments. But their games take an unexpected turn when flighty blonde Lucia reveals surprisingly deadly powers.
Gaius, a brilliant military student, must protect the girls and plan for war against an enemy nation while ignoring his growing attachment to Olivia. As a Vestal Virgin she has taken a holy vow of chastity, and the consequences of breaking it are severe.