Haikyuu Various x Reader : Your Heart is my Symphony

BAM! The doors opened loudly causing the volleyball players to flinch. A certain girl holding a violin case walked over to the guy with the blonde hair and a red tracksuit, "unfortunately Ukai san, I'm going to use this gym for the whole month. See, I have permission from the vice principal" stated the girl while showing the permission form to Ukai....

"WHAAAAAAAT?! " shouted the Karasuno members.