Kanon is an anime series that is similar to Air, since the visual novel was made by the same developer and the animation is done by the same studio as well. However, do not think that Kanon is a direct knock off from Air (since Kanon was released chronologically before Air). Well unto the review!
The first disc contains episodes 1-4 and these episodes pretty much introduce all of the main characters of the series. The main characters: Yuichi, Nayuki, Ayu, Shiori, Makoto, and Mai. Of course you are also introduced to side characters as well. In this disc you get to know about Yuichi and a brief history about his past with Ayu. We get to see Yuichi interacting with people whom he has met before but doesn't remember as well as meeting with people for the very first time. Pretty much that describes the first volume, since the story is mostly revolving around Yuichi as he adjusts to the place where he used to live 7 years ago. This anime falls most likely in the school life, drama, slice of life and supernatural genre, though it can be considered "harem" as well. The animation is simply stunning and the music is beautifully composed. The voice acting is great for both Japanese dub and English dub (though I prefer Japanese dub).
I highly recommend this to anyone, particularly those who are fans of anime. Recommended for any age, though I would put it at 12+.