I was worried the ending might feel rushed when I heard about how short the series was, but I think this is almost perfect. It doesn't overstay its welcome at all and it really hits all the points I want for characters development and tying up threads. Amazing series.
Really like her character are growing with her age. Reiri get so much experience and got more wisdom following it. The ending is satisfying. Great story from the author of Parasyte.
And last but not least, thanks for the translations, Helvetica Scans.
I may be reading too much into the 7 ri thing but that distance and view of mt fuji are awfully similar to where Aokigahara's location which is roughly 20 something km away from the base of the mountain in a straight line.