Thread:BlurayOriginals/@comment-3554524-20150113134759/@comment-3554524-20150113135108

You choose between one or the other. Only Lu OR Ciel can have a job change. The other character will still get new skills though, and the switching will become a backup technique if your combos aren't going well. Basically, it gives the character you choose new combos and makes them way stronger than the other character, but the other character will still have good use, of course.

You will still get skills for both characters as they share a skill tree.

It may be possible to get Chilliarch Lu and (Unreleased 2nd path) Ciel or vise versa but we'll find out in good time. I sure hope that's the case though.