Kakeru enters the soccer club as a provisional member, just as the letter says. When the topic of lunches comes up after practice, Kakeru jokingly asks Naho to make lunch for him as well. Naho finds herself bewildered by his words, but feels pushed to act by the letter from herself 10 years in the future, which tells Naho that she wishes she had made lunch for Kakeru.
This is the one day I don't want you 
to invite Kakeru. Seriously.
.لا أريدكِ أن تدعي كاكيرو ذلك اليوم. حقًّا
An diesem Tag bloß nicht anbieten.
Este día no debes invitarlo. Por nada del mundo.
Este día no debes invitarlo. Por nada del mundo.
Il faut à tout prix que Kakeru 
ne rentre pas avec vous ce jour-là.
Oggi è l'unico giorno in cui vorrei non lo invitaste. Ti prego.
Não o convide hoje, de jeito nenhum.
Я хочу, чтобы ты не приглашала его сегодня. Правда.