Naho got into a fight with Kakeru on New Year's Eve, and never managed to apologize to him before he passed away. At least, that's what the letter from the future says. However, Naho now believes that she's capable of dealing with whatever may come up, and faces New Year's Eve head-on.
Remember what Nakano-sensei 
told us about parallel worlds?
أتذكرين ما الذي أخبرنا إيّاه ناكانو-سينسي عن العوالم المتوازية؟
M. Nakano nous a parlé 
de l’existence d’univers parallèles…
Ricordi la questione dei mondi paralleli
che aveva spiegato il prof. Nakano?
Segundo o que o Nakano-sensei nos disse,
 existem mundos paralelos, não é mesmo?
Помните, что учитель Накано
говорил про параллельные миры?