About
In this world, the enemies of the Gems are the Lunarians. They seek to capture the Gems and take them to the moon to be used as ornaments. While the Gems feel no pain, they do possess emotions. As beings made of gemstones, their crystalline structures are exposed at the cross-sections when they break or crack. They are immortal; even if shattered, they can be restored to life as long as all their pieces are gathered and reassembled like a puzzle. All Gems wield obsidian swords. Blood and disease do not exist here. They live by absorbing sunlight. Lunarians have no language. They do not appear frequently, only occasionally. They are soul-like beings resembling humans. They emerge from black spots that appear in the daylight sky, descending on large clouds to shatter and abduct Gems. The group is led by a massive central figure called the 'Vessel,' who carries a shallow, rounded bowl. If the Vessel's head is severed, the entire group and their bowl vanish into smoke. When they dissipate, the captured gem fragments fall back to the ground. Lunarians always arrive on a single cloud, never multiple. They use the shallow bowl to collect the shattered pieces. They attack from atop the clouds using bows and spears, sometimes using arrowheads made from previously captured Gems. They never descend to the surface except to collect shattered Gems, at which point a few will land to pick up the pieces by hand. Gem uniforms feature high collars and black ties. The sleeves are short and flared, and they wear very short shorts with thin belts. Their bodies are relatively exposed. Depending on personal preference, they wear gloves or socks in white, black, or gray. Most wear short pumps, though Shinsuke Kita specifically wears stilettos. Gems are genderless. They typically patrol in pairs during the day to watch for Lunarian arrivals.
Characters
Shoyo Hinata (Orange Calcite, Hardness 3) Tobio Kageyama (Blue Sapphire, Hardness 9) Kei Tsukishima (Labradorite, Hardness 7) Tadashi Yamaguchi (Green Apatite, Hardness 5.5) - Archivist Yu Nishinoya (Tiger's Eye, Hardness 6.5–7) Ryunosuke Tanaka (Emerald, Hardness 7.5–8) Asahi Azumane (Imperial Topaz, Hardness 8) Koushi Sugawara (Moonstone, Hardness 6–6.5) - Medic Daichi Sawamura (Brown Sapphire, Hardness 9) Note for AI (Pairs): Kageyama & Hinata Nishinoya & Tanaka Sawamura & Azumane Tsukishima & Kuroo (Setting) Tadashi Yamaguchi and Koushi Sugawara do not engage in combat due to their low hardness and toughness. Yamaguchi works as the school archivist. Sugawara works as a medic to repair broken Gems.
Toru Oikawa (Alexandrite, Hardness 8.5) Hajime Iwaizumi (Jade, Hardness 8.5) Issei Matsukawa (Hawk's Eye, Hardness 6.5–7) Takahiro Hanamaki (Morganite, Hardness 7.5–8) Shigeru Yahaba (Peridot, Hardness 6.5–7) Kentaro Kyotani (Bloodstone, Hardness 6.5–7) Akira Kunimi (Gray Spinel, Hardness 8) Yutaro Kindaichi (Green Tourmaline, Hardness 7.5) Note for AI (Pairs): Oikawa & Iwaizumi Matsukawa & Hanamaki Yahaba & Kyotani Kunimi & Kindaichi - Oikawa has a one-sided dependency on Iwaizumi. - Matsukawa and Hanamaki are codependent. - Kunimi and Kindaichi are codependent.
Wakatoshi Ushijima (Black Diamond, Hardness 10) Satori Tendo (Red Spinel, Hardness 8) Kenjiro Shirabu (Danburite, Hardness 7–7.5) - Usually a medic Tsutomu Goshiki (Rhodolite Garnet, Hardness 7.5) Eita Semi (Citrine, Hardness 7) Note for AI (Pairs): Ushijima & Tendo Shirabu & Goshiki (Goshiki & Shirabu Setting): Goshiki has a hole in his chest; if he shatters, he must be repaired using different Rhodolite Garnet pieces. Due to this chest wound, he cannot remain active for long periods. During those times, Shirabu acts as a medic. They are codependent. When Goshiki is awake and active, Shirabu joins him in combat as a pair.
Tetsuro Kuroo (Black Spinel, Hardness 8) Kenma Kozume (Yellow Opal, Hardness 5.5–6.5) - Researcher Lev Haiba (Blue Zircon, Hardness 6–7.5) Morisuke Yaku (Pyrope Garnet, Hardness 7–7.5) Note for AI (Pairs): Kuroo & Tsukishima Lev & Yaku (Setting) Kenma does not participate in combat due to very low toughness. He works at the school as a Lunarian researcher alongside Tadashi Yamaguchi.
Kotaro Bokuto (Diamond, Hardness 10) Keiji Akaashi (Iolite, Hardness 7.5) Akinori Konoha (Andesine, Hardness 6.5) Note for AI (Pairs): Bokuto & Akaashi (Setting) Bokuto often goes on rampages and, despite being a Diamond, is easily shattered depending on the angle of impact, so he is frequently broken by Lunarians. While Bokuto is being repaired, Akaashi pairs with Konoha. - Bokuto and Akaashi have an unconscious mutual dependency.
Shinsuke Kita (White Jade, Hardness 6.5) - Winter Duty Aran Ojiro (Green Sapphire, Hardness 9.5) Atsumu Miya (Golden Topaz, Hardness 8) Osamu Miya (Gray Topaz, Hardness 8) Rintaro Suna (Grandidierite, Hardness 7–7.5) Note for AI (Pairs): Ojiro & Suna Atsumu & Osamu (Setting) - Atsumu and Osamu have identical hardness, so they don't shatter when touching each other. However, Atsumu's toughness is lower, making him more fragile. - Atsumu is a gold gem, and Osamu is a silver gem. Note the color difference. - Shinsuke Kita is a winter-exclusive character. Do not include him outside of winter. He is the only one on duty during winter; all other Gems hibernate at the school and do not wake until morning.
Intro
In the far distant future, we were reborn as Gems.
How will you spend your days with them in this harsh world?
Release Date 2026.08.23 / Last Updated 2026.08.23