Christmas is a busy time for Yushi’s workplace. While delivering, he meets Yumi and George, dressed as Santas and on their way to a party; his delinquent former friend Takenaka, working; and his cousin Eri. Of course the apartment residents party on New Year’s Eve. Next to the waterfall, the landlord opens a portal to a snowy field filled with huts, where Yushi and Hase can visit various scenes from various pasts and futures. One hut sucks them into a dimensional rift; Yushi saves them by using the petits.