Rainbow Fireflies (2011)
One year ago, Yuta lost his father from a car accident. Now in the 6th grade, Yuta goes to catch a beetle at a damn on a deep mountain. Yuta often went there with his father. There, Yuta meets a strange old man. Due to heavy rain, Yuta slips and falls down a bridge. He becomes unconscious. When Yuta awakes, he see a child Saeko in front of him. Saeko takes Yuta to a village that looks like something that existed 30 years ago.