WARNING: The following contains spoilers for Episode 13 of The Misfit of Demon King Academy, now streaming on Crunchyroll.
In the series finale of The Misfit of Demon King Academy, the armies of the human realm and the dark forces of the demon world are poised to wage total war at the border. Anos is determined to avert catastrophe, so he confronts Avos Dilhevia in person. But the mysterious Avos is not just an imposter; he is the great Hero Kanon reborn in a demon's body, a demon/human hybrid. Like a true hero, he wants to keep the peace, even if it means becoming a demon and deceiving the entire world.
The Battle to Take Down Avos Dilhevia
The hero Kanon was reborn as "Ray Gransdori," a demon with an affinity for swords (as opposed to Shin, Anos' old friend). At last, the mystery of Avos Dilhevia and the world's revisionist history is coming to light. This was Kanon's plan all along: to be reborn in a demon body and claim the title of Avos Dilhevia, the demon king of tyranny. When he died 2,000 years ago, he used the mighty heroic sword Evansmana to attack fate itself and displaced Anos as the true demon king.
With Anos out of the way, Kanon prepared to be reborn as an imposter, a public enemy for the heroes of the human world to fight and takedown. After all, Jerga's immortal hatred of all demons was strong in the Asc spell and warped the minds of all humans. Only by taking down "the enemy" could that hate be satisfied at last.
The problem: Anos simply doesn't want Kanon to give his life while posing as Avos. Despite Anos and Kanon being on opposite sides of a bitter feud, Anos refuses to see Kanon give himself up like this, so he and Kanon do battle to see who can get his way. Anos breaks Kanon's sources one by one until he seizes and shatters the last one, but by the time the human and demon armies are able to see what's happening, Kanon has assumed his old form, and Anos is the demon king once again.
Everyone witnesses Kanon slaying the horrible demon king of tyranny, and Anos is killed, his body dissolving into dust. It looks like a victory, but there is a certain loose end.
Anos Fights To The Last Man
Kanon hoped that by slaying the demon king, peace would return to the land and his fellow humans would be satisfied. He underestimated the zealous hatred of his old subordinate Jerga, who is not yet ready to lay down his arms. His extreme hate for demons drives him to declare that all demons must die. Only then will justice be done, Jerga claims, and he transforms into a holy magic source and swells to enormous size. Kanon feels differently; he only wants peace and cooperation between the realms, even if it means sparing most demons. This makes Kanon a true hero, instead of the genocide-minded Jerga. However, Kanon can't stop Jerga alone, and worse yet, Jerga has an army of Zeshia clones who are ready to self-detonate.
That is when Anos resurrects himself as the demon king, despite losing his source, and he takes up arms with Kanon to face Jerga together. On top of that, Misha and Sasha have fused into a single being, and the united forces prevent the Zeshia explosion and buy time. Jerga forces the humans to remotely lend him strength through hope, and Anos responds with the Unitarian club's members and their song. In the final clash of will vs. will, Jerga is taken down once and for all.
Mercifully, Anos grants Jerga a certain measure of peace in death. As his spirit fades away, Jerga is reunited with his old lover, and he can pass on without regrets. Now peace has truly returned to the land, and the two opposing armies lay down their arms for real. There is no more need to fight.
As the dust settles, Anos approaches Eleanor Bianca and frees herself of Jerga's influence, and assigns her as Anos' own magic source. Eleanor is delighted, and she accompanies Anos, Misha and Sasha to Anos' household one evening for a quiet dinner among friends. With the world at peace and in balance once again, a little celebration is in order.