In the finale of "Bullbuster," Episode 12 unfolds a tapestry of courage and strategy as Namidome Industries embarks on a daring mission to reclaim Ryugan Island from the clutches of Shiota Chemical.

At dawn, the episode begins with the Namidome team's final preparations. President Tajima, a beacon of determination, orchestrates a complex operation: Team A dives into the dark depths of Lake Hokujin to gather crucial evidence, Team B works valiantly to sever the ominous connection between the lake and Shiota's facility, and Team C fortifies the lake as a bulwark against further intrusion.

The plot thickens as a colossal beast emerges from the shadows. Namari engages in a high-speed pursuit with the Bullrover, a dance of danger and resolve. Okino, originally assigned to a different task, is rerouted to this critical chase, leaving Muto to handle his prior duties.

Arumi, piloting the Bullbuster, showcases her unparalleled skills as a mecha operator. They forge a master plan: armed with an electroshock weapon, they aim to incapacitate the towering adversary.

The episode reaches its climax as the villainous deeds of Shiota Chemical are exposed for all to see. The once-mighty corporation crumbles under the weight of its own misdeeds, and its key figures are led away in handcuffs.

Afterward, the team gathers—a moment of camaraderie and reflection. Kanie Technologies hosts a feast to celebrate the hard-fought victory.