Iriya no Sora, UFO no Natsu
English name: Sky of Iriya, Summer of UFO
Genres: Drama, Romance, Sci-Fi
Type: OVA, Episodes: 6
Aired: Feb 25, 2005 to Jun 29, 2005
Studio: Toei Animation
Source: Light novel
Rating: R+ - Mild Nudity
Synopsis:
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)