Naho can't give her Valentine's Day chocolate to Kakeru. Ever since what happened on New Year's Eve, Kakeru keeps putting distance between Naho and himself. But, through all the hardships, Naho refuses to give up and fully intends to tell Kakeru how she feels. And so, the time comes for everyone to face the fateful day outlined in the letters from the past, "Kakeru's Final Day."
The letters reach our past selves, 
and we manage to save Kakeru.
،وتصل الرسائل إلى أنفسنا في الماضي
 ونتمكّن من إنقاذ كاكيرو
Wenn wir dann einen Brief
in die Vergangenheit schicken
Si enviamos las cartas al pasado
y Kakeru se salva,
Si enviamos las cartas al pasado
y Kakeru se salva,
Alors même si tu envoies les lettres 
dans le passé et sauves Kakeru,
Se le nostre lettere arrivassero a noi
del passato e riuscissimo a salvare Kakeru,
Suponhamos também que as
 cartas que enviaremos ao passado
Письма дойдут до нас в прошлом,
и мы спасём Какэру.