 If you liked
Air
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 ...then you might like
Iriya no Sora, UFO no Natsu
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It really is very hard to compare both without spoiling the total experience. If you enjoyed the tear-jerking, bittersweet ending of Air, then you will probably like the story of Iriya no Sora. While not as tear-jerking per se, you might find the similarities between the main heroines quite amusing in a sense...well more like depressing really. The genres itself may be completely different, but the overall plot is relatively the same.