"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. 'there's no 100% believing!' 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'll meet hinata there. and yeah he's there. there's the place where their first meeting when their first match against each other. the source of their bond.

then the match starting, they even do a SHAKE HANDS. hinata CAN receive kags deadly serve even kags say 'hinata im not same as me when in high school' he seem not surprised instead HE GRINNING! kags must know he'll managed that. THEN HINATA SAY THAT AND KAGS RESPOND IT LIKE THAT+

HOW CAN YOU SAY KAGS NOT WAITING HINATA HOW???!!!! and yeah bj won the first set with hinata tosses for the last point. and sudden kags remember everything, his grandpa words, hinata's words, then he found hinata looking at him like 'i promise right?' hinata find him again.+