The vampire kingdom of Mildelar thrives on the Blood Games, where human familiars bound through blood pacts to vampire masters engage in brutal combat for prestige and power. These fierce spectacles determine the influence and dominion of vampire noble houses across the realm. Lyon, saved from death by the bewitching Arya Valakys—a daughter of the vampire king—becomes her familiar and is thrust into relentless battles to advance her standing. Unlike other familiars, Lyon possesses a unique source of strength. While his counterparts feed on the fear of punishment, he draws his power from an unexpected wellspring: lustful thoughts about his mistress.