I always wondered if there were people that worked off other fan translations: it makes sense, why not if you know Spanish or Korean or German?
(No offense, but I know that 'cause you left a panel untranslated on the bottom of the second to last page: solid work otherwise)
I would add an addendum to your afterword making sure to mention that the author is making your English translation available on her Twitter account, once she posts a viable way for non-Japanese fans to support her, anyway
Congratulations to Oddity for incentivizing the author herself to not only allow the English fan translation to continue, but to make it available directly to readers on the author's own twitter account!
https://nichegamer.com/manga-artist-works-with-fan-translator-to-support-english-readers/...
There is indeed a serialized version of this, most of it translated, a good chunk re-using the web version's later chapters, probably where you got mixed up
I can live with it being over: I'm just glad Tokixwa-sensei's managed to recover after the incredibly intense surgical procedure she had last February (She gave all the grisly details on her fanbox, bless her willingness to be so open with her fans)
https://tokixwa.fanbox.cc/posts/11377357