"The Fukurogi Incident" — a series of murders where 23 killers met their demise at the hands of an active police officer, Fukurogi Nodoka. After being presumed dead following her execution, Nodoka awakens to discover that a mysterious girl named Lassey has informed her that she is now part of a battle royale featuring resurrected notorious murderers. Motivated by the wish to stop further atrocities committed by these revived criminals and to eradicate their existence from the world, Nodoka immerses herself in this unpleasant game.