There is so much to fangirl over in this volume, I'm not even sure only hitting the highlights would be sufficient. I'll try.
* The opening pic with Oz surrounded by photographs, some of them obviously not from his own memories.
* ADA. I LOVE ADA. Her devotion to Vincent and his growing affection for her are one of the things I'm really starting to enjoy about this manga. (Now watch. Mochizuki will kill both of them off. ;_;)
* Echo's growing independence.
* Fang's protectiveness toward Lily. Seriously, I fell in love with Fang in this volume.
* I loved and hated what happened to Elliot's mother. On the one hand, her blind fanaticism and belief made it clear something extreme had to be done. On the other...well, I don't know what to say. Watching that hurt.
* Oz and Jack. It's debatable in this volume just when Oz is Oz and when he's Jack. Oz has already shown he can give a pretty good imitation of how he acts when Jack takes over. And there's a number of similarities between the two. However, when Oz talks about what he's going to do to Yura, it's hard to believe it's Oz talking, especially when Jack clearly shows up later. It just doesn't seem like Oz.
* Oz and Alice. The changes that are taking place within their contract are fascinating in this volume. Oz seems more himself, and yet he's not himself. Alice's memories come together more.
Actually, when it comes to Oz, Alice, and Jack, this volume deserves some serious time examining the images/plot.
* Break and Gil. Gil's flashbacks, his realizations, his growth in this volume are all amazing, and brings us one of the best lines in the whole series.
* Break and Reim. Gah, I love their friendship!
* Elliot and Leo are obviously the focus by the end of the volume. And the revelations surrounding Elliot tore me up.
Small warning: this volume ends on a pretty intense cliffhanger, soooo...on to volume 15!