Mashin Hero Wataru: The Seven Spirits of Ryujinmaru

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 Ne