Kotoko is supposed to spend Christmas eve with Jinko and Satomi, but they cancel on her unexpectedly. Kotoko is now all alone at the Irie family’s house. Meanwhile, on his way to Shigeki’s company’s 20th anniversary party, Naoki sees Jinko and her boyfriend in town. On the other hand, Kinnosuke coincidentally encounters Satomi and her boyfriend at the restaurant Aihara. Kinnosuke decides to surprise Kotoko, since she is spending Christmas eve all alone...
But if it were your girlfriends, 
I bet they'd be quick to betray you.
Si fuesen tus amigas,
 te darían la espalda de inmediato.
Pero seguro que tus amigas 
sí te darían la espalda.
Dans la même situation,
Se fossem as suas amigas, 
elas viriam correndo.