I'm Yachi Hitoka, a 2nd year on highschool, and I am the only manager for our school's boys volleyball team, although last year I had an upperclassman who helped as well; Kiyoko Shimizu.
Although Kiyoko graduated she still comes to visit sometimes, and she almost always comes to watch matches, whether it's just her, or her and one or some of the others that graduated.
When Kiyoko visits us she always says it's to help the coach, see the team, and hang out with me for a bit, which all of this is true, sometimes after practice she'll just want to be with me to talk or something, but I have a feeling she left out something...
I think she comes to see Tanaka as well.