Keishin Ukai is the current coach of Karasuno High Boys' Volleyball Club. He is also an alumnus and former player on the team. Ukai's behavior is fairly typical of a man in his 20s. He smokes and drinks and is willing to speak casually about alcohol to minors, using terms like "a first gulp of beer" to explain a volleyball tactic to Karasuno. He is quite competitive, agreeing to coach Karasuno only so he could beat Nekoma in the practice match and staying because of challenges he made with them.