So... is Iriya no Sora, UFO no Natsu finished or not?
It is a bit ambiguous in this case.
Why?
The anime finished before the manga:
Anime finished: June 29, 2005
Manga finished: February 27, 2009
MangaUpdates contains information about the anime adaptation and indicates that it is complete.
Watching Order (by release date)
Here you have all the anime relations we detected ordered by release date, so you can see the reason for this status in context and also use it as watching order.
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Synopsis
Iriya no Sora, UFO no Natsu centers around Asaba Naoyuki, a high school student with a fascination for UFOs.
He spends his summer trying to catch a glimpse of them near a local military base, fueled by rumors and local legends.
Upon returning to school, Asaba encounters the enigmatic Iriya Kana, a girl who is clearly different and harbors secrets.
Asaba's ordinary high school life begins to unravel as he discovers the existence of a hidden world, hinting at a deeper conspiracy linked to Iriya and the mysterious activities surrounding the military base.
The story explores the connection between Asaba, Iriya, and the unsettling reality lurking beneath the surface of their seemingly normal town.