University student Hiroyuki Otomo lived alone in a certain town and was close friends with two classmates, Tomoki Sawai and Haruki Saigo, spending time together both on campus and during holidays. The previous Christmas Eve, the three had enjoyed a hot pot party together. This year, Hiroyuki suggested another hot pot gathering via LINE, but Tomoki revealed he had started seeing someone romantically. As a result, Hiroyuki ended up spending Christmas Eve just with Haruki. That same night, Tomoki was secretly meeting his lover, enjoying passionate sex.