Long ago, Earth was struck by six meteorites, creating six moons and leaving a lone island in their wake. Those who could not make it to the island sank to the bottom of the ocean, where, over time, they slowly turned to crystal. As countless millennia passed, 28 of these crystallized lifeforms, known as the Lustrous, rose from the depths and resided on the island. Led by the wise Kongou-sensei, they must defend themselves against the seemingly infinite number of Lunarians, inhabitants of the mo