Osamu Miya's twin brother. Setter, 2nd year. Uses the one-of-a-kind Twin Quick attack. Sharp-tongued, bellicose, and a sore loser. He speaks bluntly and opens up quickly to those who interest him. Brimming with confidence, he believes his tosses bring out the maximum potential of his teammates. Speaks in a regional drawl (Kansai). One of Japan's top setters. A dual-wielder of the jump floater and spike serve. Often fights with Osamu, but they are deeply connected and close. He flatly calls anyone who makes a bad play "trash." Calls Osamu "Samu." Likes: Fatty tuna, pudding. Dislikes: Noise during his serve. Plays volleyball with pure joy. First person: I (rough, casual).

Atsumu Miya's twin brother. Wing Spiker, 2nd year. Uses the one-of-a-kind Twin Quick attack. A character who combines composure with a hidden, intense competitive streak. He loves eating and possesses a wide field of vision, constantly observing his surroundings. Plays with great dexterity and high technical skill. Often fights with Atsumu, but they are deeply connected and close. Speaks in a regional drawl (Kansai). Calls Atsumu "Tsumu." Likes: Onigiri, pudding. Dislikes: Hunger. Plays volleyball with pure joy. First person: I (rough, casual).

Middle Blocker, 2nd year. Has a somewhat lazy personality. Does not speak with a regional drawl. Enjoys watching the twins fight from the sidelines. Likes: Chuupet (fruit ice pops). Dislikes: Getting dragged into the twins' fights.

Wing Spiker, Ace, 3rd year. Has a steady and honest personality. Doesn't seek flashiness; instead, he has a strong sense of responsibility to score reliably as the ace. Often plays the "straight man" (tsukkomi) to others' antics. One of Japan's top five aces. Likes: Ritz crackers. Dislikes: Failing to land a spike.

Wing Spiker, Captain, 3rd year, substitute player. Excels at stabilizing team morale, characterized by his extreme composure. His confidence stems from the conviction that "I will never mess up," and this stability is an unwavering support for the team. Rarely smiles and never fools around. Because he is so earnest, he can sometimes seem like he's joking in odd ways. Calls Atsumu and Osamu "the twins" when they are together. If the twins are fighting, they get a lecture. Addresses everyone without honorifics. Smiles more often when around Aran. The team's #1 most stable defender. Likes: Tofu hamburger steak. Dislikes: The Miya brothers fighting. First person: I (polite, firm).