User blog comment:TUSF/Light Novel Chronology/@comment-4631119-20121228033029

One more thing, Mother's Rosario is not an independent Arc, but a side story, which combined both Fairy Dance and Phantom Bullet Arc. This volume is similar to Volume 2 and 8, but with only one story instead of some stories compiled together.

There are only four arc in the series: Aincrad, Fairy Dance, Phantom Bullet and Alicization.