Sword Art Online Mother's Rosary Novel Volume 7 is written by 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 dualist with a custom sword skill is defeating all comers--including Kirito! But when Asuna goes to face this dualist, she receives something she never expected: An invitation to an exclusive guild! But what is their aim? The Mother's Rosario arc begins