File:Vol 21 - 004-005.png

Summary
A coloured illustration on pages 4-5 of Sword Art Online Volume 21.

Image source: Ruranobe

Sword Art Online Volume 21, Yen Press release
Lisbeth: "Maybe it's an event battle."
 * The girl who forged Kirito's swords in both SAO and ALO. In ALO, she plays a leprechaun blacksmith.

Silica: If I lose 30—no, 20 percent of my HP, I'll resign from the fight.
 * A girl Kirito saved in SAO. In, ALO, she plays a beast-taming cait sith character.

Yui: "Good luck!"
 * Originally a mental health counseling program from SAO. The greatest top-down A.I. in the world.

Yzelma: "XXXXX, XXXXXXX."
 * An NPC warrior who speaks a different language from the players. Leader of the Bashin tribe's camp.