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.
We don't want to laugh without 
knowing what you're going through.
.لا نريد الضحك ونحن لا نعرف ما الذي تمرّ به
Wir möchten auch nicht lachen,
ohne zu wissen, was dir auf dem Herzen liegt.
Nosotros no queremos reír
ignorando tu tristeza.
Nosotros no queremos reír
ignorando tu tristeza.
Nous n’avons pas envie de rire 
et d’ignorer ton chagrin !
Non vogliamo ridere e scherzare,
completamente ignari di quanto stai soffrendo!
Nós não queremos apenas nos divertir
 e ignorar como você se sente!
Мы не хотим смеяться,
когда знаем, что тебе плохо.