A boxing anime that stops mid-tournament to say: what if the real threat wasn't competition, it was assassination disguised as sport. The Shadow Clan doesn't box to win; they box to erase you. That single premise fractures everything Ryuuji thought he understood about his team's dominance, because you can't punch your way out of an opponent designed to kill you before the ref even calls the match.
Japan's junior boxing champions barely catch their breath after a grueling victory. With the World Tournament looming in Tokyo, the Golden Japan team throws itself back into training, hungry to prove themselves on the international stage. Their plans shatter when a mysterious organization strikes: the Shadow Clan, assassins who've weaponized boxing itself, abducts team member Kiku without warning. The message is clear. Ryuuji and his teammates face an impossible choice between abandoning their tournament dreams to save their friend or walking into a trap designed to test which young boxers truly deserve to represent Japan. The Shadow Clan doesn't fight for sport or glory. They fight to eliminate rivals, and they've chosen this moment to challenge everything the Golden Japan team has built. What starts as a rescue mission becomes something darker: a confrontation that will force our fighters to question what boxing means to them and how far they're willing to go to protect both their friend and their legacy.