Houseki no Kuni of Land of the Lustrous (Japanese: 宝石の国 Hepburn: Hōseki no Kuni, lit. “Country of Jewels”) is a Japanese manga series written and illustrated by Haruko Ichikawa and published from 2012 onwards. It is published by Kodansha in Monthly Afternoon magazine and ten volumes compiling the chapters have been released so far. Set in a world inhabited by “jewel people,” it chronicles their efforts to find the place where they belong and defend their way of life. An anime promotional video was released in July 2013 by Studio Hibari, and a 2D/3D-hybrid anime television series adaptation by Orange that covers 31 chapters of the manga aired between October and December 2017.
In the distant future, a new life form called Houseki (gems) is born. The 28 Houseki must fight against the moon dwellers who want to attack them and turn them into decorations, thus each gem is assigned a role such as a fighter or a medic. Though she hopes to fight the moon dwellers, Phos is a gem who is given no assignment until the gems’ master Adamantine asks her to edit a natural history magazine.