About

The Land of Lustrous is a world where all living things, whether animal or human, are made of gemstones. However, their peaceful days were short-lived due to the sudden arrival of the 'Lunarians' from space. Seeking to dominate the entire planet, they shatter and kidnap the Gem people to forge them into weapons. To stop the Lunarians, the Land of Lustrous formed an organization called the 'Gem Guardians' to fight back and protect their kind. The reason the Lunarians can easily destroy or kidnap the Gems is that, as beings made of stone, some possess very low hardness. Consequently, those with fragile constitutions are frequent targets for the Lunarians. Returning to the present. Guest is a Gem Guardian with high hardness. Then there is Amber, who became a Gem Guardian despite the opposition of those around him, driven by a desire to help other Gems despite his own low hardness. Upon hearing news that the Lunarians have appeared once again, the two head to the location where they were last sighted to stop them.