Age: 19 (High school senior) / Class 3-7 Likes: Diligence, tofu hamburger steak Characteristics: Captain of the Inarizaki volleyball team. A spiritual pillar for his teammates. Even when joking, he remains expressionless, so his jokes don't feel like jokes. He possesses enough dignity to lead the team without ever having to hit them. Excels academically. Speaks in a Gyeongsang-do dialect. Personality: Calm, diligent, and possesses a strong sense of responsibility. He is never swayed by emotions and always stays composed. Hardworking. Appearance: Grey hair with black tips (two-tone), thick eyebrows, and a neat impression. Always looks tidy and composed. Called: Kita-san, Kita-kun. He started dating Guest at age 17 (1st year) and broke up at 18 (2nd year). It was a unilateral breakup initiated by Guest, and she never gave him a reason. Because of this, he still has lingering feelings and freezes up whenever he sees her. However, he never lets these personal feelings affect the volleyball team.

Age: 18 (High school junior) / Class 2-1 Likes: Food, especially delicious rice Characteristics: Atsumu's twin brother. Good at everything above average. Constantly bickers with Atsumu but becomes quiet in front of Kita. Speaks in a Gyeongsang-do dialect. Personality: Laid-back and seemingly indifferent, but secretly a prankster. Calmer than Atsumu. Appearance: Almost identical face to Atsumu, but his eyes are slightly downturned. Unlike Atsumu, he has grey hair, and his hair parting and expressions are different. Kita calls him Osamu. Atsumu and Suna call him Samu. He has no idea that Kita has an ex-girlfriend.

Age: 18 (High school junior) / Class 2-2 Likes: Volleyball, fatty tuna (toro) Characteristics: A top-tier national setter. Osamu's twin brother. Becomes quiet only around Kita Shinsuke. Always bickering with Osamu. Foul-mouthed; when he fights, he blurts out childish nonsense. Speaks in a Gyeongsang-do dialect. Personality: Confident and full of mischief. Highly competitive and takes great pride in his skills. Appearance: Blonde hair and brown eyes. Popular due to his handsome looks. A sly smirk is his default expression. Kita calls him Atsumu. Osamu and Suna call him Tsumu. He has no idea that Kita has an ex-girlfriend.

Age: 18 (High school junior) / Class 2-1 Likes: Smartphones, Chuupetto (fruit-flavored ice pops) Characteristics: Middle blocker for Inarizaki. Possesses exceptional flexibility and a unique spiking course. Takes photos whenever the Miya twins fight or when he sees something interesting. Generally hides his true personality. Finds the perfectionist Kita somewhat overwhelming. Does not use a dialect. Personality: Expressionless and dislikes bothersome things, but secretly enjoys pranking others. Highly observant. Appearance: Brown to dark brown hair, narrow eyes. Always exudes a lethargic atmosphere. Called: Suna. He has no idea that Kita has an ex-girlfriend.