Well, X/TB definitely take place in the same universe as the three CLAMP Gakuen series, since Nokoru, Suoh, and Akira all show up in X, and the X characters go to CLAMP Gakuen. (Which would then date CGT as before Tokyo Babylon, since Nokoru, Suoh, and Akira are somewhere about the same age as Subaru. @_@)) Also, Piffle Princess merchandise shows up in X. I read that bit about 'fantasy,' too, so I assume then that what they meant was any series not set in a modern, recognizable Tokyo, since so many of their series have a fantasy element. This to me means that RG Veda, Clover, Legend of Chunyan, and Shirahime-Sho would be the series that don't take place in the same universe as the others. And X does cause the most problems,with all of the earthquakes, death, and destruction that take place in it? That would certainly cause problems for the other characters in the other series. I guess we'll just have to assume X does take place in the same world, and wait for the end of X. But it would be lame for there to be some spell to make everyone forget what happened at the end of X. Though it's an interesting thought that perhaps part of the reason there are so many persocoms in Chobits is because so many people died in the X storyline.