As the fourth installment in the series, Revenge begins at volume 40. Despite part three’s abrupt ending, Revenge starts off slowly, re-introducing its cast through episodic cases that gradually become longer and more complicated. As before, the series focuses on the revenges carried out by the Grudge Shop for a wide range of clients, usually those affected by a sexual assault, murder of a loved one, a financial devastation or an unbearably humiliating experience.

Many of the cases involve the story’s main antagonist, Yoroitsuka, leader of the resentment firm, whose “Avenge” app allows clients to bid for hired killers. This plot continues from the previous installment, when Yoroitsuka was introduced as a former member of the Grudge Shop.