ID:INVADED put a lot of ideas and mysteries out there, but it was never that coy about the Big Bad being the perpetually closed-eyed Chief Hayaseura. That the start of the final showdown with John Walker came down to a one-on-one physical fight—with Narihisago literally kicking at him as he blocked with his cane—almost felt like a surrender at first.
Then Hondoumachi arrives on a huge shark and bites off part of Hayaseura’s face. This is going to be two-against-one, at least in the Id Well.
Hondoumachi steals Hayaseura’s hat and she and Narihisago lure him on a chase to retrieve it that leads back to the first Id Well we ever saw: Fukuda’s world-in-pieces. The three meet on a platform, Hayaseura has a seat, and they talk it out, with Hondoumachi analyzing her former chief as having a God complex, hence all the sevens.
Seven serial killers with seven victims each. When Hondoumachi counters that Narihisago was the eighth, she parries with the fact that Narihisago isn’t a true serial killer, but a serial “suicide inducer” whose only victims were serial killers. If he’s the “Cornerer”, the last person he was meant to corner was Hayaseira himself.
What Hayaseura doesn’t know his adversaries already have him right where they want him. The seat is actually a cockpit placed there courtesy of Fukuda, and Hondoumachi traps and neutralizes him in a well-within-the-well. But that still leaves her and Narihisago trapped in a well.
To get out, they’ll have to put their hope in a “third pillar” they’re not even aware of—Momoki, in the iso suit in the real world. Asukai’s powers have grown in intensity, testing both his body and the limits of his suit. Mitsuoka just manages to bring him back to life after his lungs fill with vomit and his heart stops.
He eventually finds Asukai, who is initially happy someone has come to help her, but then she sees the gun in Momoki’s hand. Asukai laments that when she was first found, she asked to be killed and put out of her misery, and that that remains to her the best and only solution. The thing is, Momoki can’t do it, and when she tries to, the gun doesn’t work in her hand.
Instead, Momoki has her return to the Mizuhanome pool, which will at least contain her expanding powers. He can’t promise they’ll find a solution that would enable her to leave that pool without murdering her, but they’re not going to murder her, nor are they going to stop looking. Before the Kura is released from her powers, Sakaido meets Kaeru in a beautiful well—seeing her alive for the first time, and bidding her farewell.
Everything related to Hayaseura, his John Walker persona, Asukai and her remaining comatose dreamers are buried from the public, as is Kura’s way, and everyone basically gets back to work. Presumably the difference is that Hondoumachi is now a full-time id well diver beside Narihisago (who may or may not still be a prisoner). The two even participate in joint dives, since they worked so well together to bring down the chief.
This was a solid, good if not great finish to a show that borrowed a lot of ideas from sci-fi and psychology and managed to merge them into a mostly cohesive and original story. Compared to the ambition of the earlier issues it raised, the ending falls a bit short, but the show is still to be commended for not completely coming apart at the seems, and for being ambitious, confident, and smart in the first place. It’s a story I’d love to return to, should favorable circumstances align.