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A little timeline of Kou's traffic safety charm earring cause I noticed this recently and I think it's neat
He's had that traffic safety charm for a while, all the way back since he was 5, only back then he wore it hanging around his neck
Jumping to first day of middle school, he still hasn't worn it as an earring yet
The earliest point in time I can find of him with the earring is from the new tl, where he's shown to have already had it by fall of second year
So he must've pierced his ear somewhere between the first day of middle school and fall of second year
My personal hc is he pierced it when he turned 13 as a singular act of teenage rebellion borne from being neglected by his dad
That or it's just yet another questionable fashion choice made by a 13-14 y/o lol