Ancien to Mahou no Tablet: Mou Hitotsu no Hirune Hime
English title: Ancien and the Magic Tablet: Another Story
Japanese title: エンシェンと魔法のタブレット～もうひとつのひるね姫～
Type: ONA
Source: Original
Episodes: 2
Status: Finished Airing
Aired: Mar 10, 2017 to Mar 17, 2017
Duration: 12 min per ep
Rating: G - All Ages
Studios: Signal.MD
Genres: Drama, Fantasy

The story will center on the adventure of Ancien, a girl that keeps appearing in Kokone's dreams. The story of the dream is one that Kokone's father told her as a mysterious fairy tale when she was little. 

(Source: ANN)