The streets are covered in a blanket of snow. Even though Myako can't stand the cold, she can't help but feel jealous when Yuurei-chan goes to play outside in the snow with Fushihara in the snowman outfit she bought for her. After concealing these feelings from the others, Myako stays behind to house-sit for Fushihara when suddenly Yuurei-chan appears excitedly back from outside at the front door. She's brought a little something to lift Myako's spirits. But what might it be...?

An unknown sender has been sending letters to the apartment every day since New Year's. All of which demanding that they move out. Thinking this is just somebody's idea of a prank, Fushihara doesn't think much of it at all. But then one day, instead of a letter, what do they receive but a package in the mail! Fushihara and the two little ghosts are frozen stiff as something inside the package begins to stir. What might be about to come out...?