To create an advertisement for a renovated amusement park, Momose and Shirosaki go on-site to gather information. From merry-go-rounds to roller coasters, the two try out various attractions after Shirosaki states, "It's essential to enjoy the attractions firsthand to create a good advertisement." On the way home from their successful on-site research, the train they are riding in suddenly stops after a power outage. Inside the pitch-black train car, Momose tells Shirosaki about the day he decided to change jobs.

At Kinjo's suggestion, the four hold a Christmas party and bring presents. Momose continues his daily search for a new property as he decides where to move but is saddened that his fun life living together with Shirosaki will come to an end. After the party, and after much deliberation, Momose decides to move forward and contacts a real estate agent to assist with his move. And finally, the day of his move arrives...