With her dislike of Yuzu and Mei's relationship, Matsuri uses the secret photo she took at the shopping mall to blackmail Mei into fooling around with text-pal on Christmas. Meanwhile, Yuzu knows nothing of this and struggles to bake a cake for her first Christmas together with Mei. While her excitement builds, Mei comes home and breaks the news that she won't be able to join their Christmas Party due to student council work...
You've stolen my position as her 
little sister, on top of that.
Und meine Position als kleine Schwester
hast du mir auch weggenommen.
Y además me robaste mi lugar
como su hermana menor.
Y además me robaste mi sitio
como su hermana menor.
et tu m’as piqué
ma place de petite sœur.
E tu mi hai rubato il posto di sorella minore.
Você roubou minha posição
de irmãzinha também.
И ты забрала у меня
место её младшей сестры.