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.
When you're ten, they 
call you a prodigy.
Wenn du zehn bist, 
nennen sie dich ein Wunderkind.
Cuando tienes 10, te llaman prodigio.
Cuando tienes diez años, 
te llaman prodigio.
À dix ans, on est un prodige.
A dieci anni sei un prodigio.
Com 10, lhe chamam de prodígio.
В десять лет — ты чудо.