Man. Incredible respect to everyone involved with letting me see this. Thank you for the translation.
And I'm thankful to the mangaka for managing to hit a certain medium I almost never see. Most genderswap works are usually either almost wholly comedic in tone if not outright bawdy, cheesy romance, or they're a deadly serious affair.
This comes closest to the latter, but I really respect the restraint and nuance. The story is happy to let the conflict grow organically without having to force it and it keeps it somewhat understated. It's weirdly easy to envision this story happening in reality somehow, aside from the almost impossible event.
On the note of realism, one of the things that jumped out at me most is how the protagonist was "realistically" sexist. As in, rather than some nearly cartoonish display of a woman-hater or someone outright bitter towards women, he just simply does not understand why women get "special treatment" and quietly resents it. That is so many guys before they someday (hopefully) understand why special accommodations can sometimes be necessary for women, such as maternity leave.
My favorite part has to be his wife. It could've been an ass-pull for her to suddenly seem so nice but I really got the sense for a long time now she's just as much wanted to connect with him but couldn't find the words. Not a loveless marriage, just a sexless one with long-cold embers of passion. But the love really is there and... yeah, that's how people often are in reality, in a complicated way that can be hard to convey in fiction. There can be a huge disparity between how one acts, how one doesn't act and how one feels.
I'll be watching this one with great interest. Again, thanks for the translation.
EDIT: Also want to point out that page 42 pretty much acknowledges trans people exist, without necessarily making it the point of the story. I can't remember the last time I saw a non-comedic TS manga do that. This is a strikingly mature story.