Sword Art Online: Hoshinaki Yoru no Aria

Synopsis

A month has passed since 10,000 players were trapped in Sword Art Online, 2000 have already died and yet the first floor boss hasn't been defeated. In the depths of a labyrinth, the fated first meeting between Kirito and Asuna unfolds. The players, tired of the stalemate prepare to challenge the first floor boss, The Kobold Lord. And in the end Kirito will have to make a choice. A choice that will redefine the relationship between players and Beta Testers. A choice that may cost a piece of himself. (Source: Wikipedia)