Which is a problem. But more about that later. Let me get some positives out of the way.
Oku really nails the banal cruelty of internet comments that you see everywhere online, from 2chan to reddit to MAL itself. We saw this in Gantz, and he continues his skewering of 21st century online discourse to entertaining effect here.
I sometimes see people complain about the backgrounds in his manga, because they seem traced, but the realistic backgrounds serve to immerse you in the story that feels very familiar, despite all the outrageous shit going on. When the antagonist of this story goes on a killing spree, it's all the more horrific to witness when it's set against mundane realistic backgrounds.
The antagonist is so menacing, so obscene in his nonchalant method of dealing death to everyone around him, that Oku himself becomes mesmerised by him, sacrificing the protagonist of his own story. Mr Inuyashiki is relegated to the background at a certain point and becomes super passive, even disappearing entirely from the narrative.
Oku establishes some rules to how technology works in this story, how Mr Inuyashiki can hear people in trouble. And yet, during one of the many shocking massacres in the story, for some baffling reason, Oku decides not to include the protagonist in the ensuing sequence. There is no in-universe reason for why our elderly protagonist would not have heard the cries of dozens of people being shot to death, and rushed to do something about it. But for whatever reason, Mr Inuyashiki is not involved at all.
Mr Inuyashiki himself is sorely missing for a substantial portion of this manga and it's infuriating.
So much mayhem happens, so much misery, and the entire time you'll be wanting to scream at the manga "where the hell is the protagonist?". The antagonist is so fascinating, it makes you wonder if Oku should have made the entire story about him to begin with. To have a tale about an antihero, like Light Yagami, up against the world, to see his rise and fall.
Anyway, at some point Oku remembers his protagonist and gets him involved again, but his passivity never really goes away, he has to be pushed by exterior circumstances or people in order to do anything remotely meaningful. The last half of the manga is disaster porn, populated by useless characters doing nonsensical things within repetitive and inefficient panels. It's like Oku forgot how to be a mangaka.
The climax of the story is also insulting and without coherent thematic meaning.
Inuyashiki is unfortunately a narrative failure and a disappointing follow-up to Oku's magnum opus Gantz.
