Series protagonist Wataru, who goes to the world Soukaizan in response to a call about an incident there. An evil presence shrouds the area, and the robot Ryuujinmaru's power has been sealed. Together with his friends Shibaraku, Toraou, and Himiko, Wataru begins a new journey. 
 
(Source: Anime News Network)

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**Non anime roles:**
- Hyakume Babaa - Kamen Rider Black RX (TV Series)

This adaptation of Wataru will show new aspects of the world Soukaizan.
 (Source: Natalie, translated)

The story is about a 9-year old boy named Wataru Ikusabe that is magically transported to a magical realm of the gods called Soukaizan which he is supposed to save. In his quest to save the realm, he manages to transform a clay sculpture into a somewhat autonomous (small) Super Robot. 
(Source: Wikipedia)