To the Forest of Firefly Lights (2011)

One summer, a 6-year-old girl named Hotaru Takekawa came to her grandfather's house for vacation. She broke into the forest of a mountain god that was said to be full of monsters. Just when she was anxious because she was lost, a big boy wearing a fox mask appeared in front of her and led Firefly to find the way home. Although Firefly is extremely grateful, the boy forbids her...