The single title from another publisher hits the seventh-place spot with Kodansha Comics is Sailor Moon with the first Eternal Edition volume.
Once outside of there we see other titles like Tokyo Ghoul, Dragon Ball Super, and even Dr. Stone charting alongside the latest Skip Beat! release.
The folks at ICv2 have put together a look at what was selling during the month of September 2018 and have broken out the manga to its own chart for tracking.