Now this should makes more sense, the dev or artist error on body ratio has now cause her to look (unintended) a bit plump.

She's a chunky little cutie.

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Little girls gotta grow. Little girls gotta eat.

Plump Mikura is now my headcanon.
It makes me want to cuddle her more than the rest of the kaiboukan.

Well, maybe not more than Etorofu, because she's such a good girl.