Intrigued by the tale of a mountain god, six-year-old Hotaru Takegawa loses her way in the ancient forest while visiting her uncle. Exhausted and desperate for help, Hotaru is thrilled to find a masked forest spirit named Gin. She learns the hard way that she should not touch the boy, or he would disappear. In spite of this, Gin leads Hotaru out of the forest and warns her never to return when she promises to come again with a gift.