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.
Yep, like a dolphin!
Ja, wie ein Delphin!
¡Sí, como un delfín!
¡Sí, como si fuera un delfín!
Oui, on dirait un dauphin !
Sì, sembra un delfino!
É, como um golfinho!
Да, как дельфин!