Noelle Gardner is a witch with many secrets, who lives and works at Theania Temple. Mamoru Knight is a werewolf cursed to transform whenever he hugs someone. Together the two of them team up to exorcise malice spirits and the like, using their wit, their claws, and enchanted mirror to aid them. After quelling Bianca's tantrum and rescuing Gail, things take a turn when Baron—the land god of Oberon City—interferes and offers a proposition that Noelle cannot refuse. Noelle must escort Baron to Theania Temple. To make matters worse, in an act of protectiveness and chivalry, Mamoru insists on coming along. However, Mamoru's presence at Theania Temple could lead to him learning one of Noelle's many secrets, and once one secret is spilled there is no telling how many more are to follow. Divine Rule is the fourth book in the Match*Make Me a Vigilante series. It is highly recommended that the books be read in order.