Keep in mind also that this game comes from Japan. While they do have a concept of Christmas, most of their christmas trees are either freakishly small/fake and go inside, or are put outside since Japanese houses are...not all that big. The soft spot on my friend's head from walking into Japanese door frames should attest to that.

We demanded big trees, trees go outside, so they put the trees outside.
My dorm didn't even get a nice christmas tree on christmas ;_; a couple drunk guys almost stole one. From outside.