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.
So he's curious.
Also ist er neugierig.
Sin duda le da curiosidad.
Sabía que le picaría la curiosidad.
Il est donc curieux…
Per quanto ne dica, gli importa.
Então ele está interessado.
Всё-таки, ему интересно.