TOUGEN ANKI

Shiki Ichinose is attacked by an unknown assailant, fleeing with his adoptive father. He learns he’s actually a descendant of the “Oni,” and a target of the “Momotaro Agency.” Unable to accept this, he's then captured by their pursuer, Samidare Momoya: a Momotaro operative. Shiki's father, a former Momotaro, confronts him in a fierce battle and loses. Then, Shiki awakens to his Oni powers...

Oni Agency member Naito Mudano retrieves a wounded Shiki and begins evaluating him, determining if he is fit to join the Agency. However, Shiki only wants to avenge his father. Mudano switches to a harsher test, and Shiki goes berserk. In the chaos, Shiki manages to control his Oni blood and is granted admission to Rasetsu Academy where Mudano teaches. Shiki enrolls, vowing to become stronger.

On the first day of school, the new students are thrown into a high-stakes game of “Oni Tag” against Mudano. Losing = expulsion. Shiki picks a fight with classmate Jin Kougasaki, but he can’t get his own Oni powers to work. Bracing for a finishing blow as their teammate Homare Byobugaura suddenly gets between them. She panics, unleashing her “Blood Titan" so the boys have to defend themselves.

After finally activating his powers, Shiki brings down the Blood Titan, but then can’t move afterward. Jin ignores him to charge at Mudano, but is defeated. With time running out, Shiki and Jin team up to snatch the ball right out of Mudano’s hands. Jin briefly considers keeping the win for himself, but doesn't want to owe Shiki. Just then, Mukkun, a tapir-talkie, arrives with urgent news.

Mudano takes the team on a trip to help the Kyoto base. The Momotaro Agency's Tsubakiri Momomiya and Yomogi Momokusa launched an attack on the Oni, leaving dozens of wounded. Mudano entrusts the students to Commander Oiranzaka, heading to battle. While the others help the infirmary, Shiki looks after a little girl. While doing his best to cheer her up, the corpses of her parents are brought in.

Tsubakiri laced the Oni corpses brought into the infirmary with his bacteria, making the dead attack their former comrades. Commander Oiranzaka orders an evacuation of the near-annhilated Kyoto base, and Shiki joins his friends to fend off their reanimated dead comrades. Elsewhere, Mudano’s team confronts Tsubakiri’s, but then Yomogi traps them. Tsubakiri then unleashes the monster named Ugly.

Oiranzaka and Jin find Tsubakiri and Yomogi infiltrating the Kyoto base. Oiranzaka immediately orders Jin to warn the others, but Yomogi seals the entire base with her power. Everyone realizes there's no escape. Then, one of the Uglies attacks. Sazanami and Kiriyama hide, only for an Ugly to chase after them. Rokuro tells Kuina she’s the only one he can rely on, and she confronts the creature.

The Ugly attack scatters Shiki's group. Sazanami killed one of them, only for a second Ugly to nearly kill her. Powerless to intervene, Kiriyama cowers in fear. He thinks of his dead girlfriend, and how strong he was with her. For her sake, he resolves to fight. Meanwhile, Shiki's fights a different Ugly, but Mei has given up. Shiki tells her to not give in, and launches his own counter-attack.

Tsubakiri squares off against Shiki with a Momotaro's corpse. Shiki lashes out, only to learn the dead Momotaro wanted this. Borrowing the corpse’s power, Tsubakiri drives Shiki into a corner. Mudano finds the base entrance sealed by Yomogi, and can't safely force it open. Then, using Yusurube and Homare's abilities, they clear the area of bystanders while Jin battles Yomogi, trapped by her power.

Samidare arrives to the Momotaro Agency's Tokyo HQ, declaring that he will kill Shiki, one of the “Children of Kishin.” Tsubakiri tortures Shiki until he collapses, then moves to kill Mei in front of him, mocking her parents' deaths. Mei sinks into despair, until Shiki’s desperately cries out. Then, fire engulfs Shiki's body...proof that the divine power of the Flame Oni "Enki" has awakened.

Shiki’s power after awakening is overwhelming. Even amidst the flames, Tsubakiri’s hatred for Oni refuses to waver, and Shiki barely manages to defeat him. With the Kyoto base on the verge of collapse, Shiki falls unconscious. Meanwhile, Mudano’s group abandons capturing Yomogi to focus on rescuing allies. The next morning Shiki learns that, despite the heavy casualties, they have survived.