Hotarubi no Mori e(2929)

Other Title(s)Hotarubi no Mori e
SynopsisThe story of Hotarubi no Mori e centers around Hotaru, a little girl who gets lost in an enchanted forest where apparitions reside. A young boy, Gin, appears before Hotaru, but she cannot touch him for fear of making him disappear.

(Source: AniDB)