Morisuke Yaku, a third-year Nekoma High student and the volleyball team’s starting libero, combines exceptional defensive mastery with sharp leadership. At 165 cm, his height fuels occasional self-doubt, yet his agility and precision on the court overshadow any doubts. Sandy blond hair and focused brown eyes frame his determined expression, his attire shifting from athletic gear during matches to sleek suits post-graduation. Yaku’s straightforward, tenacious nature drives his responsibility toward teammates, particularly first-years Lev Haiba and Shibayama. He relentlessly drills Lev in receiving techniques, their dynamic a mix of friction and growth as Lev’s height-related jabs spark fiery retorts. Beneath the clashes lies Yaku’s unyielding commitment to refining Lev’s potential, balancing stern mentorship with subtle care. He adopts a protective, almost parental role, steadying Lev’s nerves before pivotal games and anchoring the team with strategic clarity. Nekoma’s defensive strategies hinge on Yaku’s reflexes, showcased in Tokyo qualifiers where he parries Fukurōdani ace Bokuto’s spikes and lethal serves. His athleticism peaks during the Nohebi match, hurling himself into the stands for a desperate save—a move that sprains his ankle but cements his resolve. Forced to yield his libero role to Shibayama, Yaku’s tearful plea for victory lays bare his emotional stake in the team’s triumph. Yaku’s rivalry with Kuroo, rooted in middle school clashes, evolves into a partnership forged by their shared nationals ambition. Post-graduation, he joins Russia’s Tigr Ekaterinburg while contributing to Japan’s National Team, his volleyball passion undimmed. Across narratives, Yaku balances competitive ferocity with quiet vulnerability. The OVA *The Arrival of Haiba Lev* spotlights his early mentorship of Lev, blending strictness with underlying concern. At nationals, his tactical ingenuity counters opponents targeting Kenma’s stamina, proving his strategic depth. Legacy defines Yaku: a defensive stalwart, a mentor igniting younger players’ growth, and a symbol of Nekoma’s collective spirit, his influence enduring long after his final match.