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.
Oh, yeah, my dad was researching that.
.نعم. والدي كان يدرس ذلك
Oh, mein Vater hat das erforscht.
Papá está experimentando.
Mi padre está experimentando.
Je t’en préparerai un demain.
Ah sì, mio padre se li sta un po' studiando.
Ah, falando nisso, o meu pai 
estava testando receitas com ele.
И правда, папа даже проверял.