Re-read this again, they didn't end up together in person but they did end up in the heaven, they could finally be together forever in heaven! It's so good I could read this again! Deserve to have an anime adaptation too!
Guys this isn't clearly yuri, because it's more of like platonic friendship rather than yuri, based on the authors work I don't think the author is making this gl/yuri, but for the story, damn I love it I also like the ending even if they didn't end up together, it's still a masterpiece!
It seems to be implied they ended up together! Someone in the comment section pointed out that they were wearing rings at the end of Chapter 84.5 KirstenSy
Then that's a relieved then, it's really a good story.
Mui reminds me of Mu from Milgram idk why