The exclusive Japanese U-17 training camp was previously only open to the top high school players in the country. All of this changes when 50 of the nation's best middle school players are selected to join the esteemed training facility—including 12-year-old tennis prodigy Echizen Ryoma. But what seems like an ordinary training camp quickly becomes something far greater than any of the middle schoolers are expecting. The climb to the top of the Japanese tennis world is perilous, but even that journey pales in comparison to the world stage that awaits beyond the summit.