Really, really, really, great.
The story is great, and the artwork is excellent, very, very. How should I say it?
This manga gave an aura of beautiful sadness, just like Majo no Shinzou
Every component (story, artwork, character, the talking, everything) is so coherent and support each other very well.
Mangaka that can beautifully draw their character is many, but IMO, one that can portray the beauty of a nature in his/her manga is rare, very. And for me, this mangaka done it very, very, well. The nature scene he/she made is so so so beautiful, to the point made me feel so... jealous to the character inside that scene. It's just black and white (OK, grayscale), but you could get the 'feeling'. We could feel the aura of ghost village, or when it still has its villagers.
The story, IMO, is... hmm... not simple, yet not complicated. Sad, yet not depressing. Happy, with a hint of sadness...