Having now read all of Junji Itou's work except for No Longer Human, and The Liminal Zone, long-story-wise...
compared to Tomie, Intersection Boy, Remina, and Uzumaki, this was decent. 6/10.
Although it's not the most grand, sophisticated, extraordinary of his concepts, as his only complete story that's the left with a "straightforward" ending unlike practically all of his stories that are left mysterious with wonder and questions, this was fairly good.
It's not exactly as creative in a sense as Tomie, Uzumaki, etc. or as horrific in drama like in Remina of the world being in chaos, but it had good elements and was entertaining as is.
Crawling sea-creatues is defintely terrifying. Especially crawling sharks, and even more shocking was the whale.
The source of past army technology most likely an invention from the grandfather of the male protagonist's uncle being the thing that somehow was sent to carry any living being to spread an infectious gas to kill is fascinating.
The procedure itself is disgusting but works in adding to the disturbing fear of living dying beings or corpses riding on these mechanical gripping spikes with tubes in one's ass/mouth to- I don't know, keep the infectious gas inside and move with the gas' bodily spread for the machine to work.
The obsession of his uncle with the passion to create his own superior machine to the one (most likely) his grandpa created is bizarre after his own hand was captured and he was forced to cut it off to avoid infection, even weirder is his supposed jealousy to kidnap his assistant who apparently he had mutual romantic feelings that they never showed each other after he kidnaps her into his flying "corpse" machine.
As much as I love Junji Itou's creativity and talent where he displays his best from character, shock, fear, fascination or complexity of the lore/etc. a decent amount of his stories are unstructured for how random some plots are included in the general concept of the story.
... After Tomie and Uzumaki, this was his third long story format.
As great as Uzumaki seems, it's flawed in structure for some chosen plots and unclarity, while Tomie isn't fully straightforward in timeline, it's one of his most straightforward journey stories and works because of Tomie's trope.
Gyo arguably lacks something and simply isn't great, but it's not bad.
The mystery pacing of smell and the heroine's trauma and terrified sensitivity to the reputing smell of death was fairly captivating throughout the story.
It reminded me of Uzumaki where the male protagonist is the only one to be aware of the town's danger, just like she was the only one who was conscious of the dangerous smell of the deathly gas of the dead.
The gas somehow being imbued with haunting spirits that can be clearly seen through fire as they attempt to drag you to your death was interesting. Like most of Itou's stories, it makes little sense with the lack of infomation or how or why, but it's interesting.
The dynamic of the couple having their differences, with the guy not believing her girlfriend was correct, to the whole journey of protecting her, and finding her "dead" in her uncle's machine, bloated from the infection, to then coming back to life out of jealousy of seeing him next to his uncle's assistant.
To finally the tragic ending of her machine being dragged and burned into bones against the many crawling infected corpses of humans or sea-creatures was sad but good as a "bad ending."
I particularly enjoyed the girlfriend's insanity and demise, along with the boyfriend's determination to save her,
but his moments of sadness were lackluster in emotion.
The uncle's character and his relationship with his assistant felt odd and abrupt, but I think it's an acceptable use as the source to create more choas into the plots.
The deranged circus act did indeed feel weird and arguably out of place, but I thought it was a well unique method to display the clear reveal of spirits living in the gas. That scene itself of the spirits being seen through fire was entertaining.