Fairy Navigator Runa Vol 1

From the Del Rey Manga edition

THE LEGENDARY CHILD � As a baby, Runa Rindô was left in front of a school for foster children, wearing a mysterious pendant. Now she’s in fourth grade and strange things are starting to happen around her. It’s only a matter of time before she discovers her secret powers—and her quest as the Legendary Fairy Child begins! � Includes special extras after the story!

Source: Anime News Network Encyclopedia