| Iriya no Sora, UFO no Natsu | |
 Volume 1 cover of the light novel | |
| イリヤの空、UFOの夏 | |
|---|---|
| Genre | Drama, Romance, Science fiction |
| Light novel | |
| Written by | Mizuhito Akiyama |
| Illustrated by | Eeji Komatsu |
| Published by | MediaWorks |
| Imprint | Dengeki Bunko |
| Demographic | Male |
| Original run | October 2001 – August 2003 |
| Volumes | 4 |
| Original video animation | |
| Directed by | Naoyuki Itō |
| Produced by | Hiroaki Shibata |
| Written by | Michiko Yokote |
| Music by | Hiroshi Takaki |
| Studio | Toei Animation |
| Released | February 25, 2005 – July 29, 2005 |
| Runtime | 25 minutes each |
| Episodes | 6 |
| Video game | |
| Developer | MediaWorks |
| Publisher | MediaWorks |
| Genre | Sound novel |
| Platform | Nintendo DS |
| Released | January 11, 2007 |
| Manga | |
| Written by | Mizuhito Akiyama |
| Illustrated by | Tōko Kanno |
| Published by | ASCII Media Works |
| Magazine | Dengeki Maoh |
| Demographic | Seinen |
| Original run | October 2007 – March 2009 |
| Volumes | 2 |
| Video game | |
| Iriya no Sora, UFO no Natsu II | |
| Developer | MediaWorks |
| Publisher | MediaWorks |
| Genre | Sound novel |
| Platform | Nintendo DS |
| Released | October 25, 2007 |
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 Mizuhito Akiyama 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 imprint; the series was once nominated for the Seiun Award. Later, a six-episode original video animation adaptation was created based on the novels; the DVDs were released in Japan between February 25 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 was serialized in ASCII Media Works' seinen manga magazine Dengeki Maoh between the October 2007 and March 2009 issues.