- This article is about the manga adaptation of the original Progressive series. You may be looking for the original light novel.
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Sword Art Online - Progressive Volume 4 (ソードアート・オンライン プログレッシブ004, Sōdo Āto Onrain Puroguresshibu 004?) is the fourth volume of the Progressive manga adaptation. This volume covers the final part of the Rondo of a Fragile Blade story.
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