I found this to be very odd. Apparently there is a huge draw of people who go to KFC in Japan on Christmas. Although most people in Japan do not celebrate Christmas, KFC does a huge ad campaign using Christmas as a marketing tool to appeal to its customers and surprisingly it works very well for them.
“The official explanation from KFC is that a Christian kindergarten in Japan wanted to order KFC for its kiddy Christmas party. The school reportedly ask the KFC shop manager to dress up as Santa Claus for the party. He agreed, appearing at the party in full Santa gear, saying, “Merry Christmas” to the children’s delight. According to KFC, gradually, more and more schools ordered KFC for their holiday parties, and in 1974, KFC held its first special Christmas meal campaign. Decades later, KFC’s Christmas has become an annual mainstay, with people growing up eating the fried chicken during the holidays and naturally associating it with Christmas”
It is known that lines are to be expected every year.