Takeshi Kido and Kentaro Shiratori are a pair of friends who have been together for almost their entire life. One night, a strange being comes out from the lake and starts attacking them. When Takeshi and Kentaro are almost eliminated, a strange being named Kopu calls them and tells them that they are the chosen ones to inherit the power to protect the world from an evil being named Goumon. Now, they join their hands to transform into Barom One, a being with superior skills, who will fight to protect the city.

On the planet Earthdash, its inhabitants gaze on its moon and the technologically advanced lunar city of Mooneyes with awe. Dan JD, a boy living in Rollingtown on Earthdash's surface, gets caught up in Bigfoot Basketball—a fast-paced sport played with giant Bigfoot robots.

A special episode aired after ep. 490, it summarizes the history of confrontation with the black organization.

Leave it to Piyoko! Move over, Di Gi Charat! Piyoko and the Black Gema Gema Gang star in this new OVA series. From the Planet Analogue to Earth, the Black Gema Gema Gang try to kidnap Dejiko and hold her ransom to find their dream of a prosperous home!