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A Japanese-addict friend of mine recently told me that a possible translation for "you're welcome" in Japanese was "mū", but I must admit I was a bit dubious about that since I had never seen it nor heard it. I looked it up and found no entries about it anywhere.
Is it a mistake?
Definitely a mistake. The only time I hear of むー is in comics where it's the sound effect for thinking (I think you use hmmm in English). So, my theory is this person heard a conversation like...
Akimori: I did your laundry for you.
Yamada: Hmmm...but I thought I asked Ken to do it.
And might have thought むー was "you're welcome" when it was just the person thinking about something, haha.
It is possible if the individual/character answering is: male(most likely), stoic, non-talkative, old-fashion (think samurai-stereotype of old) answering a 'thank you' from someone. (Most novels I read with characters answering like this would fit this description).
Might be more of a うむ～ but it could be むー depending on the writer or character.
