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 there's a sadness behind his smile
ولكن هناك حزنٌ خلف تلك الابتسامة
Aber ich habe die Einsamkeit
hinter diesem Lachen
Pero no me di cuenta de la tristeza
Pero no me di cuenta de la tristeza
Ma dietro quel sorriso,
Porém, eu não havia 
percebido a tristeza
Но за этой улыбкой пряталась печаль,