@SuperOniichan iirc, 80's or even earlier advertisement campaign of KFC in Japan, for Xmas holidays, featured a bucket of chicken and a cake to celebrate the day. It's now a cliche tradition that features in a lot of mangas and animes, sometimes to poke fun, other times remembered warmly. I forget which but some mangas/animes have had jokes by loners/singles who lament having to spend another xmas alone with a cake/bucket of chicken.
https://www.cnn.com/travel/article/kfc-christmas-tradition-japan/index.html