As a child, Hotaru lost herself in a forest near her uncle’s place that she visits every summer. There, she had a fateful encounter with a spirit, who helped her even though he would disappear if a human being touches him. She began to visit him every summer, even as she grows; while he waits for the summer to come, for their time together to flow again.
The 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.
While visiting her uncle for the summer, six year old Hotaru gets lost in the woods outside the village. Scared, the crying girl is eventually rescued by a gentle youkai named Gin, who is burdened with a curse that will cause him to disappear if ever touched by a human. Though they are barred from physical contact, the two become close friends. But after a few short years it becomes apparent that Gin ages more slowly than humans, so while Hotaru is growing up and changing, Gin remains in stasis. How will Hotaru adapt to the complicated emotions she develops as her and Gin’s ages gradually converge?