After spending their first year of high school in peace and quiet, Haruka and Makoto run into Nagisa, a new student who was a member at a swimming club with them when they were kids.  That swimming club is being torn down, so the three of them sneak in to dig up a time capsule that they buried in the back, which is when they are reunited with Rin, the fourth member of their group who left to study abroad.
It's a boarding school, 
so he hasn't come home.
Das ist ein Internat, also ist er noch nicht nach Hause gekommen.
Como es una escuela de 
internos, no ha regresado.
Pero es un internado, así 
que no se pasa por casa.
Mais, comme il y a un pensionnat,
Si tratta di un collegio, 
quindi non torna mai a casa.
Lá é um internato, e até agora 
ele não voltou para casa.
Это закрытая школа,
так что он не приходит домой.