Christmas?

That some kinda ritual?

How could you call it a ritual...? No, that's not it...

Hm? You know what it is, Reimu?

Hmm, hmm...

You eat cake?

An' exchange presents 'n' stuff?

Hmm, I see...!

Awright! Let's do this Crisp-mess thing! She actually says "kusurimasu" (nonsense, roughly sounding like "medicine-mass") instead of "Kurisumasu" (Christmas).

It's "Christmas".