(based this off some fanart comic I saw)

It was the end of the day at the training camp and all the other Aoba Johsai members had left. Oikawa was in a bathroom stall on the toilet when he noticed something written on the toilet paper roll. Curious, he pulls the roll down slightly and reads it... The roll reads:

You should've come to Shiratorizawa

Oikawa just screeches, it's so loud you could hear it from outside