@PaterFrog I have the exact opposite feeling. I grow extremely weary of protagonists that lack any sense of an identity crisis or who get over it in a single chapter. In so many of the manga I've read, they mostly just have the cliche "oh noes I have boobies and my thang in GONE" reaction only to immediately follow it up with an "Oh well, it can't be helped" and that's literally the end of it. A small section of them will drag out the protagonist fronting about wanting to go back but that too seems completely hollow and rapidly disappears. Rarely, do they show a sincere desire to return for longer than a few chapters and even more rarely do they actually return to their original gender. I don't think I've ever seen a protagonist experience anything resembling a true identity crisis over having their gender flipped. I've seen more sincere reactions in manga about a protagonist who has their face hideously scarred or otherwise made unrecognizable.
In most gender swap scenarios, there is so little reaction to the gender swap that it leaves you questioning why it was ever part of the story. More often than not, in those cases it's simply used as an excuse to make a female protagonist that acts like a man child without shattering our suspension of disbelief too hard. Yet, they always take it way too far and shatter our suspension of disbelief anyways.
I'd like to just once see a manga where the protagonist is gender flipped, finds out it's impossible to undo, completely emotionally shuts down over it and then has to slowly come to terms with it and doesn't just treat it as a "oh well, I might as well enjoy it" scenario. That said, I can almost guarantee that if I did see something like this, they'd take it way too far and turn the character into some emo edgelord over it, since there's no such thing as moderate or realistic reactions in manga. It's like how most reactions to character deaths tend to be either of the "too bad, so sad" variety or the screaming man child variety like Simone from Tengen Toppa Gurren Lagann. Neither of those reactions are what I'd call even remotely realistic. While Simone's reaction could have been called realistic since children crying loudly over a death is a thing that happens, they really took it
way too over the top in his case. It'd be different if it was of the "I'm too deep into shock to actually react to this person's death but later I'm going to suddenly break down and cry and not know why" variety but they just straight up don't even react to most character deaths. I really can't fathom how character reactions in general are becoming so far removed from reality but it seems to just get worse with every passing year as authors try harder and harder to milk reactions out of the audience with fake overly dramatic characterizations or being lazy and just skipping it entirely. To be fair, I feel like authors in general have less and less skill at writing as the years go by and the ones who proved they are skilled either aren't really trying anymore or are outright retired/dead.
I get that you think there's plenty of things you can write about aside from the emotional adjustment to having your gender flipped but they're nearly all exceedingly minor, most have been abundantly explored already and you're really not going to get much of interest to read out of it. Sure, if you've never heard of the physical differences between genders, you might find it mildly interesting the first time you read it but you could literally just read a wiki about it and learn more than any manga will likely teach. All in all, there's little about gender bending that's more interesting than the emotional reactions people can have but it takes a skilled author to show those reactions without making it tedious and most authors just aren't that skilled. Hence, why most skip doing anything interesting at all and just use it as a prop for some comedy routine or to fulfill some fetish or wish fulfillment.
As for this manga in particular, the protagonist's reaction to being gender flipped is fairly weak. If there's ever a chapter 2, I'd be surprised if he even acts bothered by it anymore and doesn't just go with the flow. He, like so many in this genre, is getting straight railroaded into life as a girl and will inevitably give up and stop caring about it before long. This is definitely not the kind of manga you can read with your critical thinking enabled but that's the case with like 99.9999999% of manga. Yes, I did just say you can only take about 1 in a million manga seriously and this isn't the one. I can't really say much about the manga since there's only one chapter. What I can say is there's nothing here I haven't seen dozens of times before.