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.
You don't need to worry about it.
.لا تقلقي حيال ذلك
Du musst dir keinen
Kopf machen.
Ne les écoute pas.
Non preoccuparti.
Não se preocupe com isso.
Не волнуйся так.