Takeshi Kido and Kentaro Shiratori, lifelong companions, face a perilous encounter when a mysterious entity emerges from the depths of a lake to assail them. Just as danger looms large, a being known as Kopu intervenes, revealing Takeshi and Kentaro as the selected guardians destined to wield extraordinary powers safeguarding the world against the malevolent Goumon. United as Barom One, they merge their strengths to defend the city from impending threats.