Yolko

Yolko (ヨルコ) is one of the 10,000 players trapped in the online game «Sword Art Online». She was a former member of the guild «Golden Apple». She and Caynz team up to find the culprit who killed Griselda.

Before A Murder Case in the Area incident
She was part of a small guild called Golden Apple, which only had eight members and among them was her boyfriend, Caynz. One day, the group found a rare-drop item and they voted to decide what to do with it, Caynz was in favor of keeping the item, so she also voted in favor of keeping it, but after losing in the voting three to five, they decided to sell the ring. The guild leader, Griselda departed up the front lines to sell the ring but never came back, only to discover that she was dead. The guild was disbanded but the culprit was never found.

A Murder Case in the Area
While Kirito and Asuna are having dinner, she screams from seeing Caynz hanging from the church's window, later she explains that she was going to eat with Caynz but then got separated. She stays in an Inn while Kirito and Asuna investigate, she later talks to Schmitt, and gets exaltated before being stabbed in the back by the mysterious murderer that also killed Caynz. She is later seen alive with Caynz at the gravesite of Griselda, confronting Schmitt about Griselda's death. After being saved by an ambush by PoH and two other Laughing Coffin members, with the help of Kirito and Asuna, they soon found out who was responsible for Griselda's death, as it was none other than her own husband, Grimlock.