Chūya Nakahara vs. Red Dragon

Chūya Nakahara vs. the Red Dragon is a battle fought between Port Mafia executive Chūya Nakahara and the Red Dragon that is incarnated from the chaos within all abilities. The incident is also considerably one of the key events during the Yokohama fog incident.

It happened outside the Skull Fortress after Fyodor Dostoevsky instigated the phenomenon by utilizing Tatsuhiko Shibusawa's ability to his own advantage. His collection ability then produces a singularity, and the dragon was later born out of the countless abilities that are encased in his collection room's jewels.

The Special Division for Unusual Powers detects the dragon's appearance to surpass the abnormal values for singularity at least 5.5 times than during the Dragon's Head Conflict six years ago. As a result, they send in Chūya, codenamed A5158, to battle the dragon and prevent it from further wreaking havoc in Yokohama.

Prologue
After Fyodor and Shibusawa double-cross Osamu Dazai by poisoning him, Fyodor reveals his personal agenda that is quite different from Shibusawa's expectations. Fyodor then slashes Shibusawa and reveals that the latter has actually died six years ago after a young Atsushi Nakajima, whom he tortured in the orphanage, transformed into the white tiger and clawed him to death. Shibusawa's ability then separated from his body and inherited his collection, believing that he is still human but losing his memories, including his death, in the process. Shortly after, the crystallized abilities from Draconia Room give birth to a giant red dragon.

The Special Division, supervised by Ango Sakaguchi, brings Chūya aboard the Swan and flies near the anomaly site. One of his escorts, Special Division agent Mizuki Tsujimura, worries that he would not be able to kill it; despite being an ability user, she claims that he is still human compared to his monstrous opponent and that he might get killed. However, Chūya merely shrugs off her concern and advises her that there is never a time to chicken out and go home.

Battle
Chūya jumps out of the aircraft and activates Corruption, manipulating the gravity around him to prevent getting in contact with the fog. While landing atop a building's rooftop, he destroys it in the process and controls various slabs of concrete debris, using one of them as a foothold while hovering before the dragon.

As Chūya hops from one floating slab to another to get near his opponent, the dragon emits light beams from its tail, with each beam taking form of a dragon, towards Chūya. He deflects various light beams with his gravity manipulation, until some of the dragons envelop him. He immediately breaks free of them and summons a massive graviton bullet and propels it towards the dragon, the latter of which also launches a giant beam of light from its mouth. Both attacks clashed and resulted in a huge explosion.

Chūya is sent flying away from the impact away from the dragon. After a momentary pause in battle, Chūya emerges from the fog carrying an entire building, which he hurls at the dragon. After two successive attacks from Chūya, the dragon prepares to emit another beam in its mouth, but Chūya crams the building in its mouth, causing an explosion inside the dragon's entrails. Inside the body, Chūya unleashes a highly concentrated graviton, finally disintegrating the dragon's body and leaving a glow in its wake.

Aftermath
With Chūya still inside what was previously the dragon's core, he punches Dazai inside, which forces the poisoned knife out of his back and cracks the antidote capsule that Dazai had earlier taken. Dazai then awakens and touches Chūya's cheek, nullifying Corruption. As the glow begins to fade and with Chūya's energy sapped, Dazai holds him down to keep him from getting affected by the fog, which he deduces has not yet fully dissipated. Chūya then faints out of exhaustion, while Dazai leaves the rest to his comrades.

Differences Across Media
In the movie and the manga, the Special Division detects singularity levels during the dragon's time of incarnation to be five to 5.5 times higher compared to the one during the Dragon's Head Conflict, while the light novel mentions the singularity levels to be two to 2.5 times higher.

As a minor addition, the light novel identifies the Special Division's aircraft as the Swan, which Chūya and Tsujimura board before the former confronts the dragon; the aircraft's name is not specified in the movie and the manga.