Unanswered//butterfly Subtitles

In Sword Art Online, the first full-dive VRMMO, dying in the game means dying in real life. Emirun and Rex, who knew each other before entering the game, reunite by chance and join forces to survive. After their team is slaughtered by the mysterious PK known as the Black Swordsman, the two resolve to become stronger. Determined to avenge their fallen comrades, they seek out the legendary swordswoman Asuna and begin an intense training regimen. In a deadly game where even fellow players can become enemies, what fate awaits them at the end of this journey?