Sai (Final).Neuro is about to be cut open by Sai when Yako, Sasazuka and Godai stop him. Yako reveals that Sai is Seiren's child, who becomes a monster after seeing his mother's murder. The altar is now the entrance to hell, reawakening Neuro who defeats Sai. Neuro says goodbye to Yako as he flies toward the portal, using all his power to prevent hell from destroying the world. Yako is reunited with her mother, and Sai goes away. Some time later, Yako is at the now-empty office; Akane is "dead" and Godai gone, since Neuro is not there to keep him. However, Neuro returns since there are still mysteries to be solved.