Six parkour adepts (the Yamakasi without Châu Belle Dinh) open a gym in Bangkok. When the new gym starts to attract the area's kids, a local gang feels challenged. Their Eurasian leader Kien (Châu Belle Dinh) attacks the foreigners while they are having some extra training in a scaffold. They battle until police arrives. Both groups can scarcely escape. Logan (Charles Perrière) runs hereby into Kien's only sibling, his sister Tsu (Elodie Yung). Logan and Tsu, who obviously feel a mutual attraction, are right from the start about to become a modern version of "Romeo and Juliet".

Following the dangerous fight the group splits up. Only Leo (Laurent Piemontesi) and Yaguy (Guylain N'Guba-Boyeke) still stick to the plan of establishing the gym, and Leo overcomes the prejudice of antisemitism against him. Williams (played by Williams Belle) departs to visit his grandfather in an abbey. Lukas (Yann Hnautra) wants to return home and to try to fix his marriage. Kenjee (Malik Diouf) attends a local Muay Thai school. Logan is after Tsu.

Tsu is tired of being a criminal. She is anxious that either the Triads or the Yakuza will eventually kill her and her brother. But her brother Kien is determined to get back at the Triad that refused them because of their French mother. He and his gang believe they can have a future only by serving the Yakuza. Their contact to the Yakuza is Kitano (Santi Sudaros), the Japanese son-in-law of Triad boss Wong (Burt Kwouk).

Kitano has made his father-in-law believe he had broken up with his Yakuza family. Yet Wong still doesn't trust him. Kitano commissions Kien to kidnap Wong's little son. Tsu objects to this and saves the heir by disclosing Kitano's double game to Wong. Now Kitano is out for revenge. He abducts Tsu and blackmails Kien to turn himself in to the Yakuza. Kien is ordered to derelict industrial premises.

Logan, Kenjee, Yann, Yaguy, Leo and Williams arrive on time to free Tsu. But when they do, Wong appears with a great many Triad members and confronts the Yakuza. Logan, Tsu, the other traceurs and Tsu's brother Kien find themselves in the middle of a ferocious battle. They must fight their way out before they get grinded between Triad and Yakuza. A fight ensues.