Kanna injured his Achilles tendon during middle school, and although it healed, he still cannot jump due to the trauma. Despite being unable to jump because of this injury, he practiced serving every day, which is why he has become an exceptional server capable of precisely controlling the ball's trajectory. In his final middle school volleyball match, he was brought in as a pinch server, and his skill nearly secured a victory for his team, but they ultimately lost.
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