UQ Holder! volume 9 features story and art by Ken Akamatsu.

After Kitty’s shocking revelation, Tota goes to met with her again, but all he finds is a note telling him to come back in four days, or to her, 287 years. In the meantime, Dana gives Tota some big news: she’s prepared a finishing move for him! But there’s a catch: the book on how to perform the move is hidden in a box in the monster-infested castle ruins below…a challenge even before Dana sends him to a distant starting point. Can Tota complete his mission and make it back in time to see Kitty once again?