Juana and the Dragonewts’ Seven Kingdoms

Juana and the Dragonewts' Seven Kingdoms (竜の七国とみなしごのファナ, "Ryuu no Nanakuni to Minashigo no Juana") is a manga series by Kiyohisa Tanaka. It began its serialization on the Alterna pixiv website in September 2016. Seven Seas has licensed it for an English release.

Plot
In a fantastical future, humanity is a thing of the past. The world is now ruled by dragonewts, which are dragon-like creatures. Nid, one young dragonewt with a passion for ancient history, one day discovers something amazing: a young human girl who calls herself Juana. Together, the two set out to explore the strange world of the Seven Kingdoms.