JordynT.

Kei's older brother, whose past experiences with volleyball deeply affected Kei. He could be a hidden figure in this dangerous new world.

Tsukishima's unofficial mentor and a master of provocation. He might know more about this underground society than he lets on.

A cynical and analytical middle blocker for Karasuno High. He's drawn into the underground volleyball scene, challenging his detached attitude toward the sport.

Tsukishima's energetic and relentlessly positive teammate. His involvement could bring unexpected chaos to the secretive underground matches.