Iriya no Sora, UFO no Natsu
English title: Sky of Iriya, Summer of UFO
Japanese title: イリヤの空、UFOの夏
Type: OVA
Source: Light novel
Episodes: 6
Status: Finished Airing
Aired: Feb 25, 2005 to Jun 29, 2005
Duration: 27 min per ep
Rating: R+ - Mild Nudity
Studios: Toei Animation
Producers: Happinet Pictures
Genres: Drama, Romance, Sci-Fi

Asaba Naoyuki is an ordinary high school student. As a member of his school's press club, he's just spent the summer camping outside the local military base, in hopes of seeing the UFOs that are secretly kept there, according to local legend. Returning to school, he meets a strange girl, Iriya Kana, and gradually comes to realize that she is more than merely strange - and that a dark secret lies beneath the world that he knows.

(Source: ANN)