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Artist's commentary
Hang in There, Kogasa-san 3119
Then there's the difference between hiyamugi and soumen! :-) I looked it up, and it's apparently the thickness.
Specifically, soumen is under 1.3mm in diameter, while hiyamugi is 1.3-1.7mm. (Anything thicker is considered udon.)
Menchi sure is a cutie, huh. Pitiable, though.