Ep. 12: Chief Walker releases Kiki, creating serial killer Wells to trap minds while pursuing his grand investigation scheme.

Chief Hayaseura/John Walker releases Kiki within the police department, causing everyone she touches to fall into a deep sleep. Their minds are transported into serial killer id wells established in previous episodes. Hayaseura enters the Kura cockpit room with Narihisago, Hondomachi, and Fukuda, admitting he created the Kura system to catch serial killers. He views the creation of serial killers as a minor side effect of his greater cause, aiming to turn all of Kura into a giant Mizuhanome for large-scale investigations. He then enters a Kura cockpit and commits suicide, allowing his mind to continue living and working in the Well world. Narihisago and Hondomachi enter other cockpits to pursue him, while Fukuda falls into a deep sleep due to Kiki's presence. Having created multiple serial killer Wells and entered and exited Kiki's mind repeatedly, Walker now shares much of Kiki's unconscious and can freely teleport to different Wells Kiki has been part of. Narihisago and Hondomachi chase Walker through multiple id wells. Walker reminds Hondomachi of her real identity to trap her in a Well storm, but she is rescued by Fukuda, who used his arithmomania to track her down. Fukuda sacrifices his life to protect Hondomachi from Inami, who tracked down Hondomachi to exact revenge for the death of Kazuta. Inami leaves to another Well to see Kazuta but is murdered by John Walker. Meanwhile, Momoki and Matsuoka surveil Kiki from outside the department building. They obtain Nishio's prototype Mizuhanome helmet, and the episode ends with Momoki putting on protective gear as he prepares to approach Kiki.

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