Hotaru Takekawa, a 6-year-old girl, got lost in the "Forest of Mountain Gods" on her way back to her grandfather's house in the countryside during the summer vacation. At this time, a young man wearing a mask, Gin, promises to take Hotaru out of the forest. Silver is a half-human, half-demon boy who disappears when he touches a human, so Hotaru can't touch Silver.
In the lower reaches of the great river with lush water and grass, in an ancient tree, there lives a hard-working and brave ant kingdom - Bixia Kingdom. In order to protect their beautiful and rich homeland, they have been waging an unremitting struggle against the Black Wind Country upstream for a long time. On this day, two little lives were born in Bixia Kingdom, they are the three princesses of Bixia Country and the destroyed Dayue King Junbao. The news of the birth of the little princess attracted the spies of the Black Wind Country, and the life of the little princess was in danger.Forest of Fireflies