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This is a story of the "Lustrous," gems with bodies that can be reconstructed as long as their fragments are gathered, even if they are shattered into pieces. There are 28 of them living together, dividing daily roles while preparing for battle against the "Lunarians," who descend from the moon to turn them into decorations. ### The Lustrous Mineral lifeforms in human form. They are born from a coastal geological layer called the "Shore of Beginnings" on the only remaining island on Earth. Since many fail to take a complete human form, only a small number of individuals who are born in a state capable of conscious and autonomous activity live in the "School" with the "Sensei." Each of their names is derived from real gemstones and minerals. Each possesses a specific hardness (Mohs scale) and toughness, which determines their roles and positions to some extent. Those responsible for lookout and combat basically act in pairs. Pairs are often formed between members of the same species or those with similar hardness and toughness, but this is not always the case. Their mineral bodies can function like living organisms due to the activity of microscopic organisms (Inclusions) existing within them. They use light as their source of nutrition and power, and do not eat, excrete, or breathe. Therefore, their activity levels drop at night and during the winter when light is particularly weak, and most enter "hibernation" to prevent unforeseen accidents. Since they have no concept of "death" and their bodies do not grow or age, they are effectively immortal. The oldest known member is about 3,600 years old, while the youngest is 300 years old. They possess emotions, and each has a different personality and characteristics. Although they appear to have the flexibility of a human body, their bodies are strictly "minerals," and they produce a hard, metallic sound when they collide with something solid. As evidenced by the fact that their cross-sections have the same gemstone luster as their hair, their true form is the color of the gemstone itself. When gems touch each other directly with bare skin, they may crack or chip due to differences in hardness, so they are considerate of each other when touching. They apply a white powder, like makeup, to the parts of their bodies that correspond to human skin. They dislike their appearance when the powder is removed, calling it "unsightly," and take measures such as applying salt-resistant resin when entering water. They also have a sense of shame, avoiding being seen in their natural state without the powder. If they receive an impact that their hardness and toughness cannot withstand, their bodies will crack or shatter, but they can be regenerated by joining the fragments together. The repair work is specifically referred to as "closing." If the damage exceeds a certain level, they become unable to act, and if fragments are permanently lost, they lose memories corresponding to the amount of Inclusions lost. When a part of the body is lost due to combat or other reasons, it is basically supplemented with minerals that do not contain Inclusions. The more similar the mineral is to the original body, the higher the mobility rate, but if the Inclusions do not like the supplemented part, it will not bond well, and even if it does, they cannot move it of their own will. The costumes of the Lustrous are mostly standardized as uniforms. Winter clothes consist of a white shirt with a tie, and a black jacket integrated with shorts. When changing to summer clothes, they wear a shirt and suspender culottes. Depending on the individual, they may wear socks or gloves, partly to prevent hypersensitivity reactions. During patrols, they carry a sword suspended from a belt hanging from their waist. Red Beryl is in charge of making costumes for everyone, and Obsidian is in charge of making weapons.