Air in Summer

Also known as:  Air Summer Special Chapter

Air in Summer is an elaboration of the Summer Arc in the anime series where Kanna, Ryuuya and Uraha go on a journey to find Kanna's mother. It shows more events (such as running away from pursurers) that happened along the way while keeping most of the original scenes intact. (ANN synopsis)

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Producers, official website and other details: AniDB, ANN, Wiki