X.

As Kamui's last surviving blood relative gives her life to obtain the Sacred Sword, the time draws close for Kamui to decide whether he will be humanity's savoir or its scourge, a decision that has dire consequences for Fuma and Kotori as well. Meanwhile, members of both the Dragons of Earth and the Dragons of Heaven converge on Tokyo, among them Subaru Sumeragi, a powerful magic user who will help Kamui see the path he must take.