"Im here!!" is very simple words, not very special but hinata said it when kageyama needed most. when everyone already left him or even lost everything. he be there, n keep believe kags will toss to him. & #39;there& #39;s no 100% believing!& #39; but hinata proof such a thing like that exists+
they keep building that bond for 3years, believing each other, friendship, rivalry, even when hinata decided to go to brazil, he still can find kageyama and say a farawell with that expression. brightly but warm & calming expression and ofc kags believe and waiting for him+
and then after 2years separating they meet again, im sure kageyama is the one decided to go to bathroom bcs he knew he& #39;ll meet hinata there. and yeah he& #39;s there. there& #39;s the place where their first meeting when their first match against each other. the source of their bond.