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.
Forget about it. We just had 
a lot of stress building up.
.لا بأس، لقد كنّا ننفّس عن توترنا الشّديد
Ach was, der hat sich
doch nur angestaut.
Tranquila, es que ya nos tenía hartas.
Tranquila, es que ya nos tenía hartas.
Lascia stare!
Avevamo un po' di stress da sfogare!
Esquece isso.
Не волнуйся! Иногда
полезно эмоции выплеснуть.