Seiichi Yukimura captains Rikkai Dai Fuzoku Chuu's tennis team, standing among the feared "Three Demons" with Genichirō Sanada and Renji Yanagi. His undefeated streak in official matches until the Nationals finals earned him the moniker "Child of God" or "Demigod." Born March 5, he measures 175 cm tall, weighs 61 kg, and has blood type A. Academically, he excels in English, Mathematics, and Art but harbors a dislike for Chemistry due to associations with hospitals. His passions include gardening and watercolor painting, frequently tending to the school’s rooftop garden or flowerbeds as part of a daily regimen that also involves image training. Yukimura forged a lifelong tennis partnership with Sanada after meeting him at age four. By his first year at Rikkai Dai, he secured a regular spot, steering the team to back-to-back National championships. During his second year, Guillain-Barré syndrome abruptly paralyzed him. Confined to Kanai General Hospital, he overheard doctors skeptical of his tennis future. On July 27—coinciding with Rikkai’s Kanto Regional finals against Seigaku—he underwent a high-risk surgery with 50% survival odds. Though he survived, Rikkai fell to Seigaku in his absence. Returning for his third year, Yukimura pursued a third National title. Facing Seigaku’s Ryoma Echizen in the finals, he unleashed his signature "Yips" technique, stripping opponents of touch, sight, and hearing to induce paralysis. He dominated Ryoma initially, neutralizing even "Muga no Kyōchi," until Ryoma attained the "Pinnacle of Perfection" and clinched a 6-4 victory—Yukimura’s first official loss. This defeat reshaped his philosophy; he embraced tennis for enjoyment alongside victory, inviting gardening ally Shiraishi Kuranosuke to Rikkai’s garden and participating in school festivals. At the U-17 Camp, Yukimura honed his skills. After defeating Sanada 7-1 in a tiebreaker—despite Sanada briefly resisting Yips—he advanced to the 6th Court. Later, he joined the top 20 challengers against Japan’s elite, overwhelming U-17 No. 11 Fuwa Tetsuhito with an evolved Yips that trapped opponents in a delusional dream state. His 6-1 victory claimed Fuwa’s No. 11 rank. In a pre-World Cup exhibition against Germany’s Volk and Frankensteiner, he partnered Tokugawa Kazuya, using "Ability Resonance" to seize three games before defeat. During the World Cup group league, he reunited with Sanada to defeat Australia 7-5. Key relationships include his mentorship of Akaya Kirihara, whom he crushed brutally to instill discipline, and his resentment-turned-reconciliation with former senior Mōri Juzaburō after discovering Mōri anonymously supported his recovery as the "Sports Drink Fairy." His bond with Sanada remains foundational, marked by mutual respect and lighthearted teasing. An all-rounder, Yukimura employs precise returns to inflict psychological pressure. He competes with a Wing Heart (Forje Z 115) racket and Yonex Power Cushion 190 shoes, always draping his team jacket over his shoulders during matches as a point of pride.