"Persona 4 Arena Ultimax" is a manga adaptation of the fighting game of the same name, which serves as a sequel to both "Persona 4" and "Persona 3." The story is set in the fictional town of Inaba, where a mysterious red fog envelops the area, and a sinister tournament known as the P-1 Grand Prix is announced. The narrative intertwines the fates of the Investigation Team from "Persona 4" and the members of SEES from "Persona 3," as they are drawn into a conflict involving the Shadow Operatives, a group dedicated to combating supernatural threats.

The central plot revolves around the sudden reappearance of the Midnight Channel, a phenomenon previously linked to a series of murders in Inaba. This time, the channel broadcasts a distorted version of the P-1 Grand Prix, where participants are forced to fight each other. The protagonists discover that the tournament is orchestrated by a mysterious figure named Sho Minazuki, who wields a powerful Persona and seeks to unleash chaos. As the story progresses, it is revealed that Sho is connected to the Shadow Operatives and has a deeper, more personal motive tied to the experiments conducted by the Kirijo Group, a corporation with a dark history involving Persona research.

The Investigation Team, led by Yu Narukami, and SEES, led by Makoto Yuki (in his absence, Mitsuru Kirijo takes charge), must navigate the challenges of the tournament while uncovering the truth behind Sho's actions. The narrative explores themes of identity, redemption, and the consequences of past actions, as characters confront their own shadows and the lingering effects of their previous battles. Key characters such as Aigis, Labrys, and Elizabeth play pivotal roles in unraveling the mystery, with Labrys's backstory as an anti-Shadow weapon and her struggle for self-acceptance taking center stage.

The climax of the story involves a confrontation with Sho and the true mastermind behind the events, who seeks to exploit the collective unconscious to achieve their goals. The resolution ties together the arcs of both the Investigation Team and SEES, emphasizing the importance of bonds and the strength derived from facing one's inner demons. The manga effectively captures the essence of the game's narrative, blending action, mystery, and character-driven drama to create a cohesive and engaging story.