Sorata searches desperately for the answers behind Arashi's betrayal, and Kamui prepares to embrace his destiny - along with the Divine Sword - in a meeting with Fuma.
The Divine Sword is taken to the Clamp Academy for safe keeping; Kotori succumbs to a deep sleep from which she cannot wake; and Fuma undergoes a frightening change as Kamui nears his ultimate decision.
A woman claiming to be Kamui's only living relative reveals the shocking truth behind his mother's death. Elsewhere, another Dragon of Heaven emerges when Arashi is attacked by dark forces.
Subaru trained for years in the hopes that Seishiro would one day consider him a worthy adversary, but as their long-fated showdown finally begins, Subaru is torn between vengeance and the ultimate sacrifice.
Kotori dreams of a battle between her brother and the boy sworn to protect her. Under cover of darkness, Kamui is joined by Fuma as he seeks the truth about his aunt's involvement with the Divine Sword.
Fuma embraces his role in the downfall of humanity by joining Kanoe and the Dragons of Earth. Meanwhile, Subaru tempts fate with a desperate plea to wake Kamui from his tortured slumber.
Multiple battles erupt between the Dragons of Earth and the Dragons of Heaven. Kamui begins to suspect Princess Hinoto's motives, and Kusanagi's valiant last stand is marred by Arashi's shocking reappearance.
Sorata attempts to disclose the reason for his arrival, but Kamui violently drives him away. When tragedy strikes at the Monou house - and the Divine Sword is stolen - Kamui may regret his foolhardy attack.
Kamui is the lone Dragon of Heaven standing in the way of the looming Armageddon. As his fated, final showdown with Fuma approaches, he must discover a way to awaken his true powers.