Several years following the Walpugis Night incident, the metropolitan area faces a string of enigmatic killings involving pairs found in intimate settings. To address these disturbing occurrences, authorities establish the Tokken task force, which includes Imari based on her past experiences. The team begins its probe by analyzing the unusual patterns and soon stumbles upon mentions of the Spear of Longinus. Their search also reveals ties to a mysterious cult believed to be connected to the crimes.