Man, I will stop reading it if senpai graduates. I think that arc will be necessary, but I don't want him off the picture.
I want SenpaixKae all the way but Junko-sensei is shoving IgarashixKae down our throat since the beginning.
I really want SenpaixKei too, but IgarashixKei from the beginning seemed like the obvious ending. But rereading there are a lot of senpaixkei moments that I discounted because it was obvious senpai wasn't in love with her, so maybe him graduating will lead to her realizing her feelings. Maybe.
He seems like the only one the other love interests will accept with her so I can't stop being hopeful for some reason.
Fingers crossed that senpai's graduation arc will be written. He definitely gets along with everyone the best so it'd be great seeing how they react to him being gone soon.