Iriya no Sora, UFO no Natsu
Plot. "Iriya no Sora, UFO no Natsu" is a story revolving around a secret war that has been going on below the public's eye since 1947 and a group of people involved in the war, either directly or indirectly. The main protagonist is a young high school student named Naoyuki Asaba who, on the last day of summer break, sneaks into the school at night to swim in secret. However, upon arrival at the pool, he meets the mysterious Kana Iriya, who is there for the same reason. However, she doesn't know  how to swim, so Naoyuki offers to teach her how to swim. During this private lesson, a group of people show up in search of Kana and take her back to the nearby air force base where she is staying. The next day, Naoyuki is surprised to find that Kana joins his class as the new term begins. Eventually, both of them take a liking to each other and Naoyuki even gets her to join the school newspaper club. Little does Naoyuki know that Kana is in fact an expert fighter pilot engaged in a war between humans and aliens  that has been going on since the Kenneth Arnold incident on June 24, 1947. The whole world's fate rests in the hands of Kana Iriya and if she can ultimately hold off the invasion in the final battle. Media. Light novels. The light novel series of "Iriya no Sora" is written by Japanese author Mizuhito Akiyama and illustrated by Eeji Komatsu, also known for his work on "". The series was four volumes in length and published by MediaWorks under their "Dengeki Bunko" label. Eventually, the series was nominated for the Seiun Award. The Chinese translation is published by Kadokawa  Media. Original video animation. A six-episode original video animation series based on the novels was produced by the animation studio Toei Animation. The OVAs were released as six DVDs between February 25 and July 29, 2005. Five of the DVD titles are taken from the chapter titles of the novels. The OVA's opening theme was "Forever Blue" and the ending theme was "Himawari", both sung by Chihiro Imai. Video games. A sound novel and card game video game for the Nintendo DS based on the series was released in Japan on January 11, 2007 by MediaWorks. A sequel  named "Iriya no Sora, UFO no Natsu II" was released on October 25, 2007. On the same day the second game came out, a bundle pack containing the two games went on sale. Manga. A manga adaptation for the series was serialized in ASCII Media Works' seinen manga magazine "Dengeki Maoh" between the October 2007 and March 2009 issues. Two "tankōbon" volume of the manga were released between June 27, 2008 and April 27, 2009 under ASCII Media Works' Dengeki Comics imprint. The manga's artist, Tōko Kanno, is also the artist of the manga adaptation of "". Iriya no Sora