X 3 in 1 Edition Volume 3 collects volumes 7-9 and features story and art by CLAMP.

As the gears of fate turn, Kamui draws ever closer to the moment when he must make his inevitable choice: become either humanity's savior or its scourge. After his last surviving blood relative sacrifices herself to bring forth the Sacred Sword, the weapon he will need in the war to come, that moment finally arrives. With Kamui's decision, however, come unimaginable consequences for Fuma and Kotori.

Meanwhile, the members of both sides of the conflict - the Dragons of Heaven and the Dragons of Earth - converge on Tokyo, obeying the call of their intertwined destinies. Among them is Subaru Sumeragi, a powerful magic user, who arrives just in time to help Kamui see the path that he must take. But Subaru must conquer his own doubts and fears when he's finally reunited with the one person who is truly special to him - and whom he must fight to the death.