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.
But I don't know what to say!
!ولكن لا أعلم ماذا أقول
Ich weiß doch nicht,
was ich sagen soll!
Es que no sé qué decirle.
Es que no sé qué decirle.
Je ne sais pas quoi lui dire.
Ma non so che dirgli!
É que eu não tenho 
ideia do que responder!
Но я не знаю, что говорить!