A nine-year-old kid with a clay robot that falls apart every other episode is somehow still the only thing standing between a dying god realm and total collapse. Wataru doesn't learn life lessons or grow into a hero, he just keeps showing up because no one else will. This OVA doubles down: more missions, the same kid, the same ridiculous stakes, and absolutely no safety net.
Wataru thought his adventure was over. The nine-year-old hero saved Soukaizan, the magical realm of the gods, and returned home to his normal life. But a few months of peace is all he gets before he's pulled back into that world once more. This time, the threat centers on Majin Mountain, a place of immense power that holds secrets even the gods fear to confront. With danger rising again, Wataru reunites with his loyal companion: the small clay robot that proved itself in battle before. Together they'll need to master new techniques and uncover what's really stirring in the mountain's depths. The stakes feel heavier now that Wataru understands what he's truly up against. Between heartfelt character moments and inventive mecha action, this two-episode continuation balances the series' trademark humor with genuine peril. Viewers looking for straightforward adventure with charm and heart will find exactly that here: a kid facing impossible odds, armed with courage and an improbable machine.