Spoiler-free review for the whole series:

This took almost a whole volume to grow on me, but I absolutely loved it. At first I was mostly enjoying the craft of how well this was written and drawn, but the characters didn't quite click for me. Near the end of volume one, however, I found myself suddenly invested and I finished all four volumes in one go. This is a truly a beautiful manga! The series makes amazing use of its medium through its unique visual storytelling. Some of it was a little confusing at first (there are a lot of things shown that aren't literally happening, but rather metaphorical) but it came together beautifully as the story progressed.