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?
"April 6th: The first time in my life I overslept."
".السادس من أبريل: أوّل مرّةٍ أستغرق بالنوم في حياتي"
„6. April.“
"6 de abril: es la primera vez
 que duermo más de la cuenta".
"6 de abril: es la primera vez
 que duermo más de la cuenta".
Le 6 avril, je me suis levée en retard 
pour la première fois de ma vie.
“6 aprile: la prima volta
 in cui mi sono svegliata tardi.”
"6 de abril: a primeira vez na
 vida que acordei atrasada."
«Шестое апреля. Сегодня я
впервые в жизни проспала».