Hmm. This was pretty decent. It wasn't great, but certainly worth a read. I appreciate how the author was able to show some truly morbid things, without allowing them to drag down the tone of this story. This is a plain tale told in a classy way. For context, before this I had read Ms. Sudou Yumi's short story, "Please", and I adore it to this day.
All through, and increasingly so as the chapters progressed, I felt having the events arranged in reverse was an excellent decision. Read in chronological order, it would have been a sad, gradual progress of decay through the decades. A reader would have likely ended up despising Kyoko, anguished for Mitsu, and feeling empty. Somehow, this reversed order transforms what is, honestly, a very dreary set of events into something that has an unusual shimmer inside of it.
Maybe going backwards like this helps puts us in the shoes of the two characters. This is how they view everything that came after that moment, up on the mountain, and deep in their past -- all of that is a postscript. Having the readers come closer, with each chapter, to the broken fulcrum of their lives, makes that moment as undimmed for us as it is for them. That's one pretty nifty device!
I'm not sure I'm convinced about one thing, though. As the reporter observed, the personalities of the two girls seemed to have flipped after their ordeal. I get that extreme situations often cause drastic changes in people. I'm just not fully sold on how it's depicted here. It feels a bit... too pat? Not saying it can't happen in real life; in fact, I think it is the story -- perhaps the story could have done with a bit more detail in this area. No matter, though, this is a fine manga, and I'm glad to have read it.