Notes from the creator Alexa:
Some fun facts in this comic:
Delibird's "bag" is actually part of it's tail and holds all the gifts and deliveries in it!
Many Do celebrate Christmas later in Jan (like my Ukrainian ancestors). They follow a different calendar.
Kagami mochi (shown in Ash's postcard) is a traditional Japanese decoration made from two large mochi with a daidai, a sort of orange, on top. It is to bring good luck!