Gash doesn't understand why Kiyomaro abandoned him until a machine that looks like their friend forces him to choose between loyalty and survival. The movie strips away the tournament structure that usually protects both of them from real loss. A kid watching his partner get taken, trying to save him with nothing but a book and a Demon who doesn't even have a name for what betrayal feels like.
Kiyomaro gets kidnapped by a massive mechanical creature called Volcan 300 Generation 4, whisked away from his everyday life before he can even reach school. Meanwhile, Gash stumbles upon the same machine and forms an unexpected bond with it, learning that his partner has been taken to a mysterious facility controlled by a brilliant but sinister doctor named M2. M2 wants Kiyomaro to become his partner in a scheme that reaches far beyond the present moment. When the demon friends discover what's happening, they mobilize to stop M2's plans, using Generation 4's glitchy programming to their advantage. What unfolds is a high-stakes rescue mission that forces Gash and company into a confrontation with advanced technology and M2's ambitions. The film balances action-packed mecha battles with the heart that defines the series: the unbreakable bond between Kiyomaro and Gash. Expect explosive supernatural combat, surprising mechanical twists, and the kind of earnest character moments that make you root for these unlikely friends against overwhelming odds.