The Iwatobi Swim Club needs one more member before it can participate in relays.  Nagisa has set his sights on his classmate Rei, who is a member of the track team.  Despite Rei's refusal to join, but Nagisa appears intent on recruiting Rei into the swim club.
But the main reason is because 
you looked beautiful.
Aber der Hauptgrund ist, 
weil du so schön aussahst.
Pero el motivo principal es porque lo 
hiciste de una forma hermosa.
Pero la verdadera razón es 
porque estuviste espectacular.
Mais surtout parce que 
tu étais magnifique.
Ma la motivazione numero uno 
è il fatto che eri molto bello.
Mas o motivo principal é
 que você pareceu bonito.
Но главная прична — твоя красота.