Isaku Honjō is a cold-hearted prosecutor who will fabricate evidence if that is what it takes to see criminals punished. One day, he dies in an unexpected accident together with his wife and daughter and falls into Hell. There, a “Millennial Festival” held by demons is underway. The demon Bune singles Isaku out as a candidate to serve as his “devil’s proxy” and offers him a contract: if he participates in the festival and obtains the legendary Ring of Solomon, any wish will be granted—he and even his family can be brought back to life. Forming the contract, Isaku throws himself into the Millennial Festival as Bune’s agent, wielding the sword of judgment against demons themselves. Will he succeed in claiming the Ring of Solomon? A top-tier dark fantasy about a star prosecutor who now passes sentence on devils in the depths of Hell.