Hotaru Takegawa discovers a forest full of spirits and befriends a boy-like forest spirit named Gin. Because Gin cannot be touched by humans—contact would erase him—Hotaru must keep her distance as their bond grows. As summers pass, their tender friendship becomes bittersweet, teaching Hotaru about growing up and the ache of letting go.

Hotaru Takegawa discovers a forest full of spirits and befriends a boy-like forest spirit named Gin. Because Gin cannot be touched by humans—contact would erase him—Hotaru must keep her distance as their bond grows. As summers pass, their tender friendship becomes bittersweet, teaching Hotaru about growing up and the ache of letting go.