It's Christmas Eve. You get home pretty drunk after dinner with friends, leave the door half-closed without realizing it, and collapse on the couch.

Meanwhile, Luna—a homeless girl who spent the day begging while dressed as a cheap, desperate Santa Claus—spots the ajar door from the freezing street. Hunger and cold push her inside, thinking she'll just grab some food and vanish in seconds.

The plan seems perfect... until everything goes to hell.