Sword Art Online: Unanswered//butterfly Movie

Sword Art Online—SAO, the world's first full-dive VRMMO. The world where dreams should come true has been transformed into a life-or-death game where death in the virtual world means death in the real world. Emillon and Rex, who met in the real world, are reunited by chance in SAO. To learn how to survive in this harsh world, they join a reconnaissance team. However, one day, they encounter a mysterious PK (player killer) called the "Black Swordsman". When Emillon arrives at the scene, he finds Rex completely devastated, with the Black Swordsman standing next to him. The Black Swordsman has wiped out the entire reconnaissance team. To avenge their fallen comrades, Emillon and Rex seek out the legendary talented swordsman Asuna and begin rigorous training under her guidance. In a deadly war where players betray each other, what new beginning awaits at the end of the fight between these two...?