I'm so glad I found this one!! It's really a... hidden gem! (ba-dum-tiss) Perhaps even a diamond in the rough!!
Gemstone puns aside, this one is REALLY good. It's a slice-of-life action tragedy... it has those warmhearted moments but hooks its claws in you with mysteries, action, and tragedies to break your heart. The art is gorgeous and the author tells incredible stories with just paneling alone, sometimes not even needing words!
At the time of my writing this comment, the eng scans are behind the rus scans, so if you can read russian, you can read further ahead ;___; and I'm super jealous.
Houseki no Kuni