In a distant future, a group of immortal and genderless beings, known as Gems, fight to protect themselves from the Lunarians, who aim to capture and turn them into decorative objects. With a team of 28 Gems, each with a specific purpose, they must cooperate to survive.

Land of the Lustrous
In a brutal conflict, the Houseki, a group of beings, fight against the Moon Dwellers, who adorn the defeated bodies of their enemies as decorations. Each Houseki member has a unique role, with Phos, the youngest, tasked with compiling an encyclopedia of natural history.