This Satsuki was born in March... the One from Sketchbook was born in August... One more and can I call this a trope? Although I failed hard with the banana one[1]...
https://mangadex.org/title/179/sketchbook
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mr. Poneis
[1] Based on a school rule that the budget for their snacks couldn't exceed 300 yen... someone goes and asks: Does a banana count as a snack? The thing is the joke is so old that I don't have a single clue of who started it or why it's funny...