Board Thread:Editor Board/@comment-124.244.140.2-20131006032405/@comment-6697950-20131006090354

As said, chapter count does not reset among volumes from the same arc, that's why volume 4 begins with chapter 5, volume 6 begins with chapter 7 (even though volume 5 has its own chapter 7...), volume 10 begins with chapter 2, volume 11 - chapter 5, volume 12 - chapter 7 and volume 13 - Interlude IV then chapter 9.