The Nogizaka family visits Yuuto's house for a Christmas party. However, the party is cut short when Yuuto faints, having worked himself to exhaustion to buy Haruka a Christmas present. When Yūto regains consciousness, Haruka declares that she will stay by his side in order to nurse him back to health, under the guidance of a very questionable guidebook prepared by Mika. To preserve the Christmas spirit in spite of Yūto's poor health, Haruka decorates his yard with Christmas lights, and presents him with a Christmas present. He in turn presents her with his present: a ring called "Clair de lune" which, at Haruka's request, he places on her ring finger. The two thus share another precious memory together.