"Christmas in the Air" was a song that was included in PSY-S Golden Best discs which I bought a few years ago. The techno side has been toned down a bit for this one, as it sounds like something to be heard while on a leisurely trip into the countryside during the Holidays. Written and composed by the duo, CHAKA and Masaya Matsuura, it wasn't included on any of PSY-S' original albums but in a special compilation album titled "Winter Lounge" which was released in November 1986.
It's a very pleasant song....a little different from some of the other Christmas-themed J-Pop/kayo kyoku I've heard. But then again, PSY-S was always a little different.