[Balzac]

Spoiler for epilogue:

"Whom did he choose in the end?" is something that they've dodged completely. The implication that I got is that the timeline in D.C. and D.C. II comes from Ricca and Kiyotaka, but there's a chance for a Kotori-like alternate-scenario.

I do guess that Charles is somehow Aishia's grandmother, who sent the latter to Japan to find Ricca or something. And I'd lay odds that Otome's and Yume's mother was in some way a Katsuragi. (She seems to have inherited the Katsuragi mindset of being a "wizard of justice", which passed down to Otome)

My only remaining question then, is who the "reincarnated" generation are from - 100 years after the fact, D.C. II is 53 years after D.C., which might be itself ~50 years after D.C. III. That leaves a short amount of time for them to be related to Yoshiyuki et.al. in any way, which probably means - not more than a generation later? And they're maybe really unrelated to anyone from D.C. II. Just a guess.