HOUSEKI NO KUNI PV

The Gems fight against the Lunarians, beings who attack them and use their shattered bodies as decorations. Each Gem is assigned a role, and Phos, the youngest, is assigned to create an encyclopedia of natural history. Note: A promotional video that was released through YouTube in commemoration of the publication of the manga's first volume. (Source: HIDIVE) — Description from AniList community (anilist.co).