It's really unfortunate how language and culture interfered with how these characters appear when translated to English. The translators did a really good job explaining things, but I can't help but feel like the end result is a manga that needs a disclaimer to not be dismissed due to its seemingly socially regressive viewpoint with a selfish view of trans people. Like, I wouldn't recommend this manga to anyone that I know who is trans, even though there's a lot of context as to why they speak the way they do, absent of that context until the end of chapter 14, it just feels like one of the main characters is being offensively selfish. Honestly, even though it may have been a bit confusing and still a bit iffy to go with the 'she' pronoun + 'brother' combo, it would be much less off putting on a first read than the 'he' + 'brother' combination was. Of course all of this is coming from a 'western viewpoint', but anyone who is reading this manga in English is most likely reading it from a mostly 'western viewpoint'.
Unfortunately, no matter how this manga was translated, it would feel like Aki was being done a disservice (the 'she' + 'brother' combination or repetitive 'brother' methods aren't good either and she was forcefully outed as being trans multiple times in this manga), and that really sucks because she was my favorite character in this manga.