Hiroki Dan, Chief of the First Investigative Division of the Tokyo Metropolitan Police Department. An elite among elites with a brilliant career and an impeccable public image. But behind that flawless façade lies his true nature— a serial killer who delivers vigilante justice upon unforgivable criminals. This is the second official spin-off of Trace: Kasouken Houi Kenkyuuin no Tsuisou. A demonic chronicle of pleasure and judgment, where villains become prey and sins are punished in blood— The curtain rises on a dark, merciless tale of private justice.