Tohoku, where the show is set, is more or less considered the boonies as far as Tokyoites are concerned. It's why whenever characters from the region try really REALLY hard to hide their accent, as it would mark them as a bumpkin (see Ogiue from classic Genshiken , or even Konoha from Mikakunin).
Kumamiko is ALSO set in Tohoku, if I remember right, but they dispensed with the accent in that case.
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