Professor Ryo, fresh from a year of research overseas, brings his sensitive, easily-moved friend Akira to a lavish party. The atmosphere, initially one of elegant indulgence, soon descends into something altogether darker.

Akira was irrevocably changed; a new strength resided within him, coupled with an unquenchable desire. He sought out Ryo, driven by a need for answers.

Rejected by his editor, the photographer Nagasaki finds himself in a desperate situation. Silene and Kaim discover the truth behind their lost comrade, Amon.

The phone rings, and Akira’s mother’s voice fills the room with the news of her imminent return. Anticipation hums among them, yet Ryo offers a stark caution: trust no one human.

Silene sought out Amon, driven by a desire to stir the dormant darkness within him. Yet, the confrontation that followed revealed the enduring strength of Akira's human spirit.

During a nationally televised track and field competition, Ryo intends to reveal Koda, a high school athlete, as a demonic being, aiming to sow fear and suspicion within the wider community.

A pervasive dread of demons has taken root in the world, fostering a climate of paranoia and escalating violence among people. Amidst this turmoil, Akira strives to protect others like himself—those born of both human and demonic lineage.

Lost in a fog of self-doubt, Ryo seeks clarity by delving into the shadows of his own history, striving to understand the forces that drive him. Meanwhile, Miki’s father embarks on a desperate quest, searching for his wife and son who have …

Having been betrayed and brought to light, Akira finds himself marked for retribution. When Miki takes to social media to champion his inherent goodness, she and Miko become targets themselves.

Faced with Akira, Ryo discloses the truth of demonkind and his own nature. A final battle for the fate of the world now draws together humans, demons, and devilmen.