Kakeru moves to Matsumoto with his mother mother after she decides to move there for her own reasons. When she passes away on the first day of school after Kakeru transfers, Kakeru blames himself and thus refuses Suwa's invitation to join the Soccer club. Kakeru sees some old classmates from Tokyo, but none of them understand what Kakeru is going through. In the end, Kakeru becomes so distressed that he feels that he has no way out.
If we write letters to our past selves 
and send them out to sea...
...إن كتبنا رسائل لأنفسنا في الماضي ونضعها في البحر
Wir schreiben an unser
vergangenes Ich einen Brief
Si nos escribimos cartas
y las soltamos al mar…
Si nos escribimos cartas
y las soltamos al mar…
Si on jetait une lettre à la mer 
pour nous dans le passé.
Se scrivessimo delle lettere a noi stessi 
del passato e le affidassimo al mare...
Se escrevermos cartas para nossos 
"eus" passados e as colocarmos no mar...
Если напишем письма себе
в прошлом и отправим в море...