The entire Justice Choujin roster gets lured into a trap on an alien planet with their weaknesses on file. It's a premise that should have been the series finale, not a mid-run movie. What makes it work is pure escalation: every single fight matters because the roster is finite, and losing one Choujin actually costs something in a way the TV series never quite managed.
While the world tunes in to watch an epic choujin rugby match, a sinister force strikes from the shadows. The Underground Space Emperor Hydra King orchestrates a bold kidnapping, snatching Robin Mask away to a distant planet. His scheme is ruthless and calculated: use Robin as bait to draw out the Justice Choujins, then obliterate them using stolen intelligence that maps out every warrior's secret weakness. News of the abduction spreads across the globe, reaching Kinnikuman and his allies as they watch the broadcast. Without hesitation, the Justice Choujins rally together and prepare for an interstellar journey to Planet Hydra. What awaits them is far more dangerous than a simple rescue mission. Hydra King has meticulously studied their fighting styles and vulnerabilities, turning their greatest strength,their unwavering sense of justice,into a weapon against them. This is a tale of honor colliding with cunning, where heroes must overcome an enemy who knows exactly how to break them. The stakes have never been higher, and the odds have never been more stacked against them.