I concur, the chart was a big help.Thanks for the translation and the chart too. I really struggle to keep up multiple characters, so this is a great help.
We don't have a RAW link yet but I'd guess with the format, chapter structure and all that, that 3 volumes sounds about right for this series.Is this completed in jp? MangaUpdates says this is completed with 3 volumes, though mangadex still says ongoing