In the years following the Walpugis Night incident, the Tokken unit steps up its inquiry into a string of disturbing murders across the city. Imari, drawing on her earlier brush with the supernatural, works alongside her colleagues to examine the unusual patterns left behind. Their search uncovers the cryptic reference to the Spear of Longinus and draws attention to a secretive cult possibly tied to the crimes. As leads converge, the team prepares for the next phase of a deepening investigation.