Watch To the Forest of Firefly Lights (2011) Full Movie English Sub.
Original title: Hotarubi no Mori e
Synopsis: Hotaru is rescued by a spirit when she gets lost in a forest as a child. The two become friends, despite the spirit revealing that he will disappear if he is ever touched by a human.
Director: Takahiro Ômori
Writer: Yuki Midorikawa
Stars: Hiroki Goto, Asami Imai, Taya Jun
More info: IMDB, Wikipedia