Sword Art Online: Mother's Rosary Manga Series by Tsubasa Haduki, Reki Kawahara

Kirito and Sinon's battle with Death Gun is over, but mere weeks later, something strange is afoot in the next-generation VRMMO ALfheim Online. A new duelist with a custom sword skill is defeating all comers--including Kirito! But when Asuna goes to face this duelist, she receives something she never expected: an invitation to an exclusive guild! But what is their aim? The Mother's Rosario arc begins!

Asuna joins forces with the Sleeping Knights guild in their quest to defeat a major boss, but inwardly, she struggles with her ongoing attachment to the VRMMO game. When the time for battle arrives, will she be ready? And when Yuuki's secret is revealed, what will the consequences be?

Yuuki's sudden disappearance has left Asuna bereft. It had seemed like everyone was having such a good time-what did she do wrong. .. ? She turns to Kirito in her search for answers, but she may end up wishing she'd never pulled on that thread. The most heartbreaking arc in SAO comes to a tearful conclusion. .. !