Yūto is invited to come with the Nogizakas to a ski resort in the mountains. He thinks it is just for them but he quickly finds out the entire class is coming on this trip. While the group enjoys all the hot spring resort has to offer, Shiina sees the trip as an opportunity to express her feelings to Yūto—but in an attempt to hug him, she ends up groping Gento, who was covered in sheets. An enraged Akiho catches them in a compromising position and gets the wrong idea, causing Gento to pass on the group's shrine visitation the next day. The next evening, a blizzard arrives and Haruka goes missing on the top of the mountain. When Yūto, equipped with an insulated polar bear suit, finds her, they both fall down a ridge and become stuck in a cabin. As she is wet and freezing, Haruka takes off her clothes and joins Yūto in his bear suit in just her underwear. However, the two are quickly found not only because the bear suit has a tracking device, but also because the cabin turns out to be just behind the resort.
雪山近くにある温泉地の乃木坂家別荘へ、春香や美夏たちと遊びに来た裕人。メイド隊を含めた乃木坂家全員に、なぜか椎菜やクラスの友人、ルコや由香里先生まで一緒という団体旅行さながらの大所帯だ。温泉地で賑やかに楽しく過ごす一行だったが、翌日の夕方、春香が行方不明になってしまった。吹雪のなかを捜索に出た裕人は、山頂の神社で春香を発見した。だが二人は宿へ戻れなくなってしまい、やむを得ず近くの山小屋に避難することにしたが……。
미카는 유토에게도 온천여행을 같이 가자고 제안한다. 한편, 시이나는 유토에 대한 자신의 마음을 절반쯤 포기하던 중, 미련을 떨치지 못하고 이번 온천 여행 도중에 고백하기로 결심한다.
