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.
not being able to save Kakeru.
.عدم قدرتي على إنقاذ كاكيرو
Und zwar, dass ich Kakeru
nicht retten konnte.
es no haber podido salvar a Kakeru.
es no haber podido salvar a Kakeru.
Celui de ne pas avoir pu 
sauver Kakeru.
non aver potuto salvare Kakeru."
não fomos capazes de salvar o Kakeru.
что мы не спасли Какэру.