Iriya no Sora, UFO no Natsu is a Japanese light novel series that combines romance, science fiction, and mystery. It follows the story of Naoyuki Asaba, who encounters a mysterious girl named Iriya during his summer vacation. As they grow closer, Naoyuki discovers secrets about Iriya's connection to UFOs and a hidden conflict that impacts their lives and the future. The series explores themes of love, war, and the unknown.