If you use Shadow Movement to sneak into houses and a pegasus team to pull the flying sleigh... yes, in this world, it's possible to become Santa Claus! But... the Christmas tradition doesn't even exist in this world. When Rimuru tries to explain it in detail to the people of Tempest, they end up summarizing it as a "party." The Christmas cake and presents are ready, and most importantly, Kaijin and the other Dwarves create gorgeous decorations that bring the Christmas mood to Tempest. On top of that, Eren and the children treat everyone in town with their heavenly singing.
and the way things work 
are totally different...
...وكيف تسير الأمور لَهو أمر مُختلِف تماماً
Um Weihnachten jemanden
aus einer anderen zu erklären, …
¿Cómo se lo explico
a alguien de otro mundo?
¿Cómo se lo explico
a alguien de otro mundo?
dans un autre monde, à l’histoire
et à la culture différentes ?
che ha tradizioni, cultura, storia e una struttura 
completamente diversi?
como vou explicar pra
alguém de outro mundo?
Мне же надо буквально
жителям иного мира всё объяснить…