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.
I'm sorry, Nanase-kun.
Es tut mir leid, Nanase-kun.
Lo siento, Nanase-kun.
Perdona, Nanase-kun.
Désolée, Nanase !
Ti chiedo scusa, Nanase-kun.
Desculpe-me, Nanase-kun.
Прости, Нанасэ.