...Well, the idea is for them to have one LJ. I saw something pretty similar-there was a Yuugi and a Yami no Yugi that would switch places within the same LJ. The reasoning behind that I can't start off with just one of them hasn't been revealed in the story yet, but: (SPOILERZ IN WHITETEXT BELOW)


Ryuusei and Yuusei can't be more than a few feet apart from each other without feeling bodily pain, and if they get even further apart, they could die. Think about what being in two different dimensions would do to them.