Iriya no Sora, UFO no Natsu (イリヤの空、UFOの夏, lit. Iriya's Sky, Summer of the UFOs?) is a Japanese sci-fi light novel series written by Akiyama Mizuhito with illustrations by Eeji Komatsu that centers on the relationship between Kana Iriya, a high school girl who has to fight alien invaders, and Naoyuki Asaba, a member of the school newspaper club and one of her few friends. There were four light novels published by MediaWorks under their Dengeki Bunko label; the series was once nominated for the Seiun Award. Later, a six-episode OVA adaptation was created based on the novels; the DVDs were released in Japan between February 25, 2005 and July 29, 2005. Two sound novel video games for the Nintendo DS were released in Japan; the first in January 2007, and the second in October 2007. A manga series illustrated by Tōko Kanno began serialization in ASCII Media Works' seinen magazine Dengeki Maoh on August 27, 2007.