Board Thread:General Discussion/@comment-39854843-20190627174632/@comment-25396609-20190627185314

With the conclusion of Volume 6, both the Beacon and Mistral arcs have been precisely 3 volumes.

There's no reason to think they would discontinue this trend moving into Atlas and Vacuo; though after the conclusion of the first core plotline (The maidens and relics) they may move to a new format.