This is a show that remembers what mecha was supposed to feel like before it got serious. Wataru and Ryujinmaru's bond isn't built on tragedy or sacrifice; it's built on a kid and his robot genuinely excited to solve problems together. The animation explodes in the moments that matter, the side characters have real personality, and the whole thing moves with the kind of confidence that comes from knowing exactly what it is: a adventure about friendship that happens to involve giant robots. Nine episodes is short enough that it never overstays its welcome. What gets lost in the shuffle is how rare it is to find something this charming that doesn't apologize for being fun.

Wataru answers a call about trouble in Soukaizan and travels to that world. An evil presence hangs over the land, and the power of his robot partner Ryuujinmaru has been sealed away. Joined by his friends Shibaraku, Toraou and Himiko, Wataru starts a fresh journey to confront what is happening there. The nine-episode online series mixes mecha action and adventure with comedy.