After surviving the Destined Showdown, Akina Myodo receives an unexpected invitation to the Deluxe tournament, a high-stakes competition designed to determine the single strongest Vanguard fighter in the world. As the tournament enters its final phase, eight elite fighters gather to battle for the championship title. The finalists include Akina Myodo, the protagonist who initially entered the Vanguard world to save his sister; Kagetsu Yakumo, a legendary fighter and Nao's former mentor who challenges opponents with a deeply philosophical approach to the game; Suo Yobitsugi, a classmate of Akina with a dark and complicated past; Erika Myojo, whose personal history with Suo involves the death of her brother; Megumi Okura, the leader of the rogue fighter group Blackout who first introduced Akina to Vanguard; Mirei Minae, an undefeated fighter with a complex family dynamic involving Danji; Michiru Hazama, a returning professional whose presence elevates the tournament's intensity; and Ruka Miyako, Blackout's original first leader and a formidable opponent.

The setting shifts between the tournament stage and the everyday lives of the fighters as they prepare for their matches. Kagetsu poses a profound question to Akina that becomes central to the narrative: What is your reason for playing Vanguard? This query forces each competitor to examine their personal motivations, transforming the card battles into reflections of character and purpose rather than mere competitions.

The tournament unfolds through a series of emotionally charged matches. In the first round, Kagetsu Yakumo faces Ruka Miyako in a battle that demonstrates how much Kagetsu has grown since their previous encounter. Mirei Minae confronts Danji, whose return to the Minae family home stirs unresolved tensions, leading to an unpredictable fight that tests both fighters' resolve. One of the most intense arcs involves Erika and Suo, whose conflict stems from Suo's involvement in Erika brother's death. Their match becomes a vehicle for Erika to confront her trauma directly, though Suo challenges whether her feelings truly run deep enough.

Megumi faces Akina in a pivotal battle that reveals her fierce competitive side, a stark contrast to her usual warm demeanor at the card shop. As the semifinals approach, the owners of the Destined One cards receive a mysterious summons from Jinki, and Yuna begins consulting Kyohma about personal troubles. The spirit of Gabwelius, who previously sacrificed himself during the Destined Showdown, returns to watch over Akina and Erika, offering guidance from beyond.

Each match in the Deluxe Finals carries the weight of personal history, unresolved grudges, and the fundamental question of why people dedicate themselves to competition. The tournament serves not only to crown a champion but to reveal what Vanguard truly means to those who play it. The final episodes build toward a climactic conclusion where Akina must apply everything he has learned about himself and the game to determine who will be crowned the strongest Vanguard fighter.