-1

This is the sentence I heard in an anime.

コーヒーでようか or コーヒーでよか.

I definitely did not mishear it for yoi 良い. Is this some slang for yoi? If so, which is the correct one? Stress or no vowel stress.

6

The sentence is

コーヒーいれようか Shall I make some coffee?

(入れ-る or 淹れ-る can be used according to your taste)

「いれ」 part is pronounced weak in the original audio, which would explain why you heard it as 「で」.

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