Hotarubi no Mori e

Hotaru Takegawa (Ayane Sakura) is a girl who spends her summers at her grandfather's house, and one hot afternoon she wanders into the forest of the mountain god, where spirits live. There she meets Gin (Koki Uchiyama), a boy who walks beside her but cannot be touched, or he will vanish. Takahiro Omori follows the two of them through the green summers, and Hotaru keeps coming back, close enough to talk and never close enough to reach.