In short, it is crucial for most singles to have a date on Christmas Eve and the more gorgeous and romantic the betterExactly.
... the Japanese had little connection to the Christian version - so they invented their own! Syncretistic Japan pulls in random elements of Western "Christmas" and recombines in pleasing new ways! ( shocking only to Christians ). Santa Claus on the Cross and more!
_ I think the article and comments may also be interesting to Japanese, so I cited here.