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In a world where the legendary U-15 Japanese rugby team, known as the "Perfect Squad," has dominated the sport, high school rugby has lost its competitive edge—except for Kinzan Yamada, a raw and unstoppable force from a remote village. Tired of the quiet life, Kinzan enrolls at Rikuzen High, a school where the rugby club has given up on victory. With his monstrous strength and relentless drive, Kinzan shakes up the team, reigniting their passion and challenging the status quo. Alongside the team's captain, Sumiji Natsume, and a cast of determined players, Kinzan dives into the intense, exhilarating world of rugby.