虹色ほたる ~永遠の夏休み~

"Rainbow Fireflies: Eternal Summer Vacation" is a Japanese young adult novel by Masayuki Kawaguchi. The story follows Yuta, a sixth-grade elementary school student, who travels to the forest where he used to catch stag beetles with his father, a year after his father's death. There, he unexpectedly travels back in time to a village slated to be submerged by a dam 30 years prior. He meets a girl named Saeko and a boy his age named Kenzo. Yuta spends an incredible summer with them, experiencing rural life different from his modern world, and gradually uncovers the village's secrets. The work has been adapted into an animated film, using a hand-drawn style and vivid colors to depict a nostalgic and fantastic story. The film focuses on Yuta's growth and exploration of life's meaning, exploring profound themes like life and death, memory and forgetting, aiming to prompt viewers to reflect on past times and precious memories.