Is there a title for the main series, other than main series?

Im just curious, since it is easy to say the names of each spin off series, I want one for the main story, but don't know if it actually has one. I know Hermes at one point calls Bells story Familia Myth or something, but its not like the series adopted that title, and it would be too close to Familia Chronicle

So Far there are

Sword Oratoria - SO

Astrea Record - AR

Familia Chronicle - FC

And then the sad

Main Story - MS

Do I just not know the name, or does it not have one?