TV-Series
Description
Renji Yanagi, a third-year student at Rikkai Daigaku Fuzoku Middle School, balances roles as a tennis team regular, treasurer, and member of Japan’s U-17 middle school team alongside his position on its medical staff. Renowned as one of "Rikkai’s Big 3" alongside Yukimura Seiichi and Sanada Genichirou, he bears the moniker "The Master" for his strategic acumen.

Slender and standing at 181 cm with layered short hair—black in manga, brown in anime—he maintains closed brown eyes that open only during moments of sharp focus or surprise. His attire alternates between Rikkai’s tennis uniform and the U-17 jacket during matches. Unlike childhood friend Inui Sadaharu, he foregoes carrying data notebooks, relying instead on ingrained analytical prowess.

Introduced to Data Tennis by mentor Mitsuya Akuto, he later partnered with Inui in junior doubles, forging a rivalry that climaxed in the Kantou Tournament Finals. Their tactical duel ended with Inui’s tiebreaker victory, a defining chapter in their dynamic. At Rikkai, Yanagi helped secure a national title as a first-year. When second-year Kirihara Akaya challenged the team’s hierarchy, Yanagi mentored the volatile player post-Sanada’s decisive victory, navigating Yukimura’s hospitalization and simmering resentment toward underperforming senior Mouri Jusaburou.

During the Kantou Finals against Seigaku, Yanagi’s Singles 3 clash with Inui showcased their Data Tennis evolution, ending again in Inui’s tiebreaker triumph. At Nationals, Yanagi partnered with Niou Masaharu to defeat Nagoya Seitoku in Doubles 1, then teamed with Kirihara in Doubles 2 against Seigaku, securing a forfeit win after Inui collapsed mid-match.

In the U-17 Selection Camp, Yanagi confronted his Data Tennis limitations during a pivotal match against Mitsuya. Though defeated, the experience honed his adaptability. A counterpuncher by style, he employs techniques like Kamaitachi—a slicing shot causing abrupt dips—and Utsusemi, a deceptive drop shot.

Reserved yet approachable among Rikkai’s leaders, Yanagi communicates succinctly, anticipates opponents’ tactics, and often finishes others’ sentences due to his perceptive nature. Diplomatic and disciplined, he mentors Kirihara with patience, reflecting his belief in "a thousand days of training." Off-court, he gravitates toward pure literature and fine arts, grounding his analytical mind in creative expression.