third years:
koujaku: wing spiker, captain
virus: middle blocker
mink: wing spiker, ace
ryuuho: wing spiker
second years:
mizuki: setter, vice captain
trip: middle blocker
clear: setter
first years:
sei: libero
aoba: manager-san
noiz: wing spiker
ren: he plays soccer lmao
coach: haruka
faculty supervisor: haga-san
sei is actually the one totally in love with volleyball, but he's been physically frail for most of his life and gets sick easily, so when he starts high school, he doesn't join the team
aoba thinks it's totally unfair and joins in sei's place, but he's actually awful at the sport. absolutely terrible. he tries to convince their cousin ren to join w/ him but ren is like "no. sorry."
when sei learns about that he decides to join the team so aoba can quit but aoba refuses so koujaku just makes him the manager
meanwhile, sei and aoba decide to ask haruka to be their coach since they lack one. haruka is the one who made sei love volleyball so much and she's probably part of a past champion team.
sei is the princess of the court and really talented but he can't last for too long so the team members really keep their eyes on him and make sure he's okay a lot (aoba and mizuki especially)
au has a lot of mizusei too.....
this focuses a lot on sei. what do you mean sei isn't the main character.