Yūki Shibayama, a first-year Nekoma High libero (jersey #12), stands as the team’s shortest member at 162.5 cm, with jet-black middle-parted hair, dark eyes, and thick eyebrows later trimmed shorter post-timeskip. His match attire—a white jersey and red shorts—reflects his defensive role. Though initially reserved and prone to anxiety, he harbors a steel resolve to grow despite lagging behind his skilled senior, Morisuke Yaku. Frequently partnering with first-years Sō Inuoka and Lev Haiba, Shibayama provides steady encouragement during practices and matches. His pivotal moment arrives in the Spring High Preliminary against Nohebi Academy, where he replaces an injured Yaku. Targeted as vulnerable, he falters early but rallies by embracing Yaku’s teachings on Nekoma’s libero legacy. His adaptability shines as he coordinates with Lev, covering block gaps and securing a match-turning receive to fuel a counterattack. Progressing from self-doubt, he learns to prioritize team accountability over personal blame and bolsters Lev by urging him to leverage innate strengths over imitation. Post-graduation, he joins Tōkai Heavy Industries Esperanza (Division 2) as libero. Technically inclined toward controlled overhand passes, he trains relentlessly to bridge skill gaps with peers, fueled by a 280 cm jump reach and a drive to refine his craft. Loyal to Inuoka and reverent toward Yaku’s mentorship, his bonds underscore a quiet leadership style. Off-court, he favors omurice, balancing youthful tastes with disciplined ambition.