Tune is VIRGIN MOST PURE (11.11.11.11.), adapted from the Cornish melody collected by Davies Gilbert in 1822 noted in the first source at the link provided. It seems it's usually sung in F, G or Eb major.
For a melody closer to the one used in that album:
The melody makes one variation from the melody in the above link: the last note in the first measure of the third line goes down to a supertonic crochet instead of passing notes.
Thank you! I’ll let him know. He runs a podcast about Japanese Christmas music, and the translation was “Everyone is Happy,” so he had a hard time finding it. Again, many thanks!
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