Wataru, a boy in grade four, gets blown into a world in another dimension, Shinbukai, where he is told he is the hero of this world. He becomes able to summon Ryujinmaru, a robot-like partner, and he helps save the people of the world from an emerging evil power.

Related Title:
MASHIN HERO WATARU Majinzan Arc: OVA 1989 / 30min. / 2 eps.