The letter from the future details the regret felt by everyone for being unable to celebrate Kakeru's birthday. As such, high school Naho and the gang pester Kakeru about what he wants until the big day. On the other hand, 26 year-old Naho and the gang gather at the late Kakeru's grandmother's house to celebrate his birthday, like they had promised in the past.
"What a pain" goes through 
my head every single day.
.أظنّ أنّ ذلك أمرٌ مزعج كلّ يوم
Das geht mir jeden
Tag auf den Sack.
Cada día pienso que es muy molesta.
Cada día pienso que es muy molesta.
Tous les jours, elle me saoule.
E ogni giorno penso "che rottura".
Todos os dias eu penso: "que saco".
Каждый день думаю: «надоело».