So well there is the ending, as an adaptation it finished completely the source, but at the same time the source was a mess even if it was completed in 2 Volumes, thanks for translating, tho the group skipped a chapter and never went back to it lol (20.4)
Manga had a decent run for an adaptation, even tho the chapters were "splits" they were actually normal lenght weekly chapters in disguise, unlike alot of actual splits, 70+ for a weekly is fine, and if you merged them, they ended a lengthy monthly chapter, at chapter 10 it finished Vol.1 and with the rest Vol.2 (and manga ending with the 7th volume works with the name lol)
But here is the thing why this ended a mess, in the afterword of LN Vol.2 author mention that the LN was always planned to end in 2 volumes, but the moment it started to write the 2nd, it added more and more stuff that ran out of pages so had to delete alot, so LN shouldn't have been 2 Volumes if this was going to be a problem, manga fixed some stuff, but couldn't do much