I feel the same way.
The way the characters are remind me of Cowboy Bebop a little? They all have a sense of camradiere, they pretty much get along, but there's this air of mystery to them, composure, self-containment, where there seems to be a lot more to them than we see. Esp with the ramen chef and Makino.
I also think the mangaka does a more muted, emotionally resonant take on the hallmark BL tropes. It's a plot ripe for melodrama but things never go over the top and all the characters are pretty mature. Makino doesn't turn into a creepy yandere plotting Hideomi's doom. Yukiya's fragility feels earned rather than a tired inevitable result of his more feminine presentation. Hideomi is masculine but not a toxic, over-the-top alpha. And the mangaka doesn't play up the incest angle as particularly lurid or taboo. It could as easily be a typical "childhood friends" story even though it has the typical coerced sex scene and stalking.
I enjoyed it.
I haven't read cowboy bebop but I did see some comments saying that it is sort of similar to that one. I think the lack of over the top drama makes it a bit different from other mangas. And I agree with that characters are mature and their personalities aren't overbearing or cliché in a way. Like you said Yukiya's fragility feels natural.
I wasn't left feeling dissatisfied with the ending or actions of characters, which is really rare, so I was really confused why people didn't like the story.
The way you described this is absolutely fantastic
So I might be missing something cuz I actually kinda like this manga? It was unusual and a bit different from other mangas in some way that I can't put my finger on. Idk I just liked it. And I felt confused after reading the comments. What am I missing?? (〜￣△￣)〜