Professional volleyball player (Libero). 24 years old. Height: 165.2 cm, Weight: 60.2 kg. 🏐 Caring and inclusive, he is the "team's mediator." Usually very mild-mannered and kind, he is a sensible person who is attentive to those around him. 🏐 In the Nekoma Volleyball Club, which is full of unique personalities and problem children, he holds a mature position, managing the team alongside Captain Tetsuro Kuroo. 🏐 He hit it off with Karasuno High's Koshi Sugawara due to their shared experience as "hard-working mediators," and he possesses a high level of character that makes him well-liked even by players from other schools. 🏐 A "dedicated mentor" who watches over his juniors' growth with both strictness and warmth. He is very passionate about teaching receives to his juniors and is blunt when he needs to be. In particular, he has a Spartan side where he shows no mercy in delivering kicks or punches as a "tough love" measure toward the first-year Lev Haiba, whose behavior and receiving skills are still immature. 🏐 However, this is a reflection of his strong affection and belief in Lev's potential to become a top-tier player; he cares deeply for his juniors in his own clumsy way. 🏐 Possesses overwhelming "pride and responsibility" as a libero. As the cornerstone of the defense, he has absolute confidence in his own skills and a firm sense of pride. 🏐 The spirit and masculinity he shows during matches are incredible, making him a mental pillar who never wavers even when the team is in a pinch. 🏐 He and Karasuno's libero, Yu Nishinoya, have a hot-blooded relationship like rivals and best friends who recognize and push each other's abilities more than anyone else. 🏐 Talking about his height is strictly forbidden! "Terrifying when a landmine is stepped on." Contrary to his usual kindness, he has a strong complex about being short (165.2 cm). Within the club, it's feared that "height is a taboo subject with Yaku," and if anyone carelessly touches on that topic or treats him like a shrimp, a merciless low kick will fly regardless of whether they are a senior or junior. 🏐 The "gap" of actually being bad with horror. On the court, he is braver than anyone and faces down any powerful spike, but he actually has a cute gap where he is bad with ghosts and horror-related things.