Sword Art Online Progressive Vol. 4 - Light Novel Review — Taykobon

They’ve charted their way down the rivers of Aincrad’s fourth floor, and now Kirito and Asuna move on to the treasure-filled ruins of the death game’s fifth floor. However, something sinister lurks in the dark, and monsters might not be the only enemies they’ll have to worry about…

Sword Art Online Progressive Volume 04, Sword Art Online Wiki

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Sword Art Online Progressive Volume 04, Sword Art Online Wiki