「本来の姿を取り戻した「破滅ノ門」は、ムツギ(黒谷友香)の眼前に全知全能の力をもたらす「禁断の果実」を出現させる。恍惚な表情で「禁断の果実」を口にしたムツギは力を増し、その容貌も邪悪なものへと変わってしまう・・・。陰我を持つ人間を駆逐するため、術を繰り出そうとするムツギに立ち向かう道外流牙(栗山航)、白羽創磨(仲野温)、コヨリ(中澤実子)。陰我とは？人間とは？守りし者の使命をかけた戦いが始まる─。
The Gate of Destruction, which has regained its original form, causes a "forbidden fruit" which bestowed omniscience and omnipotence before Mutsugi's eyes. She promptly consumed the "fruit", attaining power boost she sought yet corrupted her at the same time. Ryūga Dōgai, Souma Shirahane, and Koyori stand against Mutsugi, who is trying to use a technique to purge humanity of their Inga. What is Inga? What is a human? The battle for the mission of the protector begins.
