I think it's very good, with only 2 volumes it's not easy to make a good story that isn't rushed. The story is unique and fun to follow. The artstyle is also very beautiful. I really like the way this manga draws human bones like 'gems'. The character development is also very good, even though it only has 2 volumes. You don't need to worry about the main character. Our female main character is strong while our male main character is smart, a suitable combination.The story is quite tense. As expected from an 'escape' concept story.

I don't understand why this manga is underrated. You should try reading it!