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.
That's probably what you're thinking.
Das denkst du wohl gerade.
A que pensaste así.
Seguro que has pensado eso.
C’est sûrement ce que tu te dis.
Non è quello che hai pensato?
É provavelmente no que está pensando.
Видимо, это ты подумал.