It had been a few minutes since Ayumu, Plume, and Satoshi entered the Dungeon Spire, a labyrinth full of monsters and treasures... or so that's what the Japanese Government and the SAO thought as they sent in their number one superhero and his party. As it turned out, they were yet to find treasures in the Dungeon, and it was clear that the team they sent was absolutely under-leveled and short-staffed.
And now they're reaping what they sow. The number one hero's party was defeated, and it was still ambiguous whether he was alive or not.