Arisa Vol 12

From the Kodansha edition

The global elite have gathered for a Christmas summit, and the King's final revenge on the world that rejected him is almost at hand! All Tsubasa can do is grab the bomb and run – but how far will she get before time runs out? And will Arisa and Tsubasa be able to forget the betrayals and go back to being loving sisters again?

Source: Anime News Network Encyclopedia