Throughout their entire lives, Takeshi Kido and Kentaro Shiratori have been steadfast friends. One fateful night, an otherworldly creature emerges from the depths of the lake and launches a vicious assault on the two pals. Just when all seems lost, a mysterious entity by the name of Kopu reaches out to them and proclaims them to be the only ones capable of wielding the power necessary to thwart the nefarious Goumon and safeguard the world. United in purpose, Takeshi and Kentaro merge their strength to become Barom One, a mighty being endowed with extraordinary prowess, as they take up the mantle of defender and set out to protect their city.