To Chronicle or not to Chronicle...

Questions for anyone willing to give an opinion: 

What I have going on right now is essentially 2 sets of stories. The Chronicles of M and the History of Mai. My plan is to write/publish a trilogy of CoM and then release a single book of for Mai that will be a trilogy of its own - so 9 CoM books, 3 Mai. The Mai books are essentially a standalone set, BUT will eventually wrap back into CoM series, thereby making them back story and a tie in for the main series. To clarify, each of the 3 Mai books are standalones and will simply address different portions of her very, very long life. I'm trying to think of a comparison to pull this together, but all I'm coming up with is The Simarillion.

That all being said, and hopefully understood, what I cannot decide is if I should somehow tie the titles all together. So, something like "Hitori: a Chronicles of M story" or "Hitori: More stories from the Chronicles of M"...something along those lines, of course, from the colon on would be in a smaller font. Honestly, I just want to make sure that when someone sees this set of books they understand that Mai's trilogy is part of the CoM world. Suggestions? Thoughts? Nude pics of.....nevermind  :P