Houseki no Kuni

Sinopsis: In the distant future, a new life form called Houseki is born. The 28 Houseki must fight against the Tsukijin who want to attack them and turn them into decorations, thus each gem is assigned a role such as a fighter or a medic. Though they hope to fight the moon people, Phos is a gem who is given no assignment until the gems' manager Kongo asks them to edit a natural history magazine. Note: A promotional video that was released through YouTube in commemoration of the publication of the manga's first volume. (Source: AniDB)

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