The weakest aspect of this manga is its characters; they just don't feel like anyone you'd run into in real life. The setting is enjoyable, but the plot is whatever to be honest. I did enjoy the vibe it gave off while I was reading it though.
If you've seen "Lost Cities of Gold", it's like that, except they stay in one place most of the time. My only complaint is that the relationships felt forced, they just didn't feel like they were developed naturally.
The only relationship that seemed to be even remotely natural was with Mar, but with Shibuki it was kind of like she decided that she liked him and why... no reason, just 'cus.