It’s the spring of Naho’s second year in high school, and Naho receives a letter from herself, 10 years in the future. The letter accurately depicts what’s about to happen, including details on a transfer student from Tokyo, Kakeru Naruse, who ends up sitting beside her in class. On top of that, the letter also begs Naho not to invite Kakeru out with her group of friends on that day alone, but why?
The reason I regret refusing must be because 
I forced the responsibility onto my friend,
لا بدّ وأنّ سبب ندمي هو أنّي دفعت بالمسؤولية
 ،على عاتق صديقتي
Der Grund, warum ich es bereue,
abgelehnt zu haben, war der,
Si me arrepiento de negarme
 es porque le cedí a una amiga
Si me arrepiento de negarme
 es porque le cedí a una amiga
Ce qui va me causer 
des regrets, c’est…
Penso il mio rimpianto sia quello di aver lasciato
 la responsabilità sulle spalle di un'amica.
Se eu me arrependi de 
ter recusado o pedido,
Я пожалела об отказе, потому что
 переложила всю ответственность на подругу,