Iriya no Sora, UFO no Natsu is a oVA anime that premiered in winter 2005, produced by Toei Animation.

About the production: the story comes from a light novel, there are 6 episodes of about 25 minutes and its current status is "finished".

Its main genres are drama, romance and sci-fi, with themes such as School and School Club.

On AniList, Iriya no Sora, UFO no Natsu has an average score of 64%, an average score, and appears on 6,124 users' lists.

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: Anime News Network)

Official synopsis from AniList.