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.
I'm telling you, you'll be a regular in no time.
.ستكون أساسيًّا بسرعة
Du wärst im Nullkommanichts
fest im Team mit dabei.
Te harás titular enseguida.
Seguro que te haces titular enseguida.
Tu deviendras 
tout de suite titulaire.
Diventeresti subito uno dei titolari, credimi.
Você vai entrar para o time 
principal em um piscar de olhos.
Говорю же, 
основной состав не за горами.