Neuro is stabbed by spears over an altar that drains his power, and Sai is about to cut him open until Yako stops him. Yako reveals she has figured out who Sai was. Sai becomes shocked by the truth. An earthquake shakes the altar and Neuro is reawakened to full power. He reveals the altar is an entrance to hell and is now opening. Sai collapses from exhaustion after losing to Neuro. Everyone leaves the pyramid as the ground has become unstable with the opening of hell. Neuro says goodbye to Yako as he flies towards the portal and uses all his powers to seal the gate. Yako notes that all has returned to normal, though Neuro hasn't come back. The episode's "epilogue" is after a short time skip; Sasazuka and Ishigaki are at a crime scene, and Ishigaki notes that it's much quieter now that the detectives aren't around. Yako is seen at the now-barren office, having finished packing all of the mystery-related items away. Akane is revealed to be "dead" again because of Neuro's lack of demonic influence. Godai enters the office and says a sad but gruff goodbye, now that Neuro isn't there to enslave him anymore. Yako resigns herself to a life without Neuro, when two men enter the office, one of them begging Yako to save him from death before being yanked away. Yako, confused, muses over what happened at the door, while, in the background, colour returns to Akane's white body. A hand reaches out and grabs Yako's head, and Yako, though in pain, delightedly turns around to see Neuro, returned, on the ceiling, the scent of mystery on the tip of his tongue. (thetvdb.com)