One night, a monster comes out from a lake and starts attacking the childhood and born-in-the-same-day friends Takeshi Kido and Kentaro Shiratori. When the monster is about to kill both of them, a thing called Kopu calls and tells them that they are the chosen to protect the world from the evil creature, Doruge. Kopu gives a radar to Kentaro and Takeshi and the ability to transform into the powerful superhero, Barom One by joining their hands. Now both boys must destroy the monsters possessed by Doruge.