After saying goodbye to the mysterious dark elf knight Kizmel, Kirito and Asuna rise to the Fourth Level of Aincrad, where their path is immediately blocked by a stormy river flowing into the gorge. With the official launch of the game, Level 4 changed a lot and became the channel floor. Having somehow reached the main city, the heroes find themselves among marble houses and gondolas scurrying everywhere. After learning that their own boat is the only way to freely explore the level, Kirito and Asuna head into the forest to collect wood and challenge the eight-meter tall fire-breathing bear known as Magnatherium! But this is far from the last obstacle on the way to passing the Fourth Level...