Sword Art Online. Progressive. Volume 3

After saying goodbye to the mysterious dark elf knight Kismel, Kirito and Asuna ascend to the Fourth level of Aincrad, where they are immediately obstructed by a turbulent river flowing through the gorge. With the official launch of the game,... the Fourth level has changed significantly and has become a floor of canals.
After somehow reaching the main city, the heroes find themselves among marble houses and gondolas bustling everywhere. Realizing that their own boat is the only way to freely explore the level, Kirito and Asuna head into the forest for wood and challenge an eight-meter fire-breathing bear known as Magnaterium! But this is far from the last obstacle on their way to completing the Fourth level…