it's not that he's stupid i think that it's more like a charm that kageyama needs, to be rational when his feelings overwhelmed him since when you get emotional you can't think straight sometimes and in kageyama case he might forget his promises to hinata..
(๑•ㅂ•)و✧ Bitch FITE ME!! How dare you assume that Kageyama is stupid, it's obvious that he wrote it down as a reminder because rereading it would help take his mind off the stuff that bugged him and that would help him prevent from breaking the promises !
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I would......im pretty stupid though so apparently me and Kageyama are in the same club XD ........he's smarter then u *Dabs* (●'◡'●)ﾉ
Is Kageyama THAT stupid that he has to write it? （￣へ￣） （￣へ￣）