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 not the issue!
Das ist nicht das Problem!
¡Ese no es el problema!
¡Ese no es el problema!
Non è quello il problema!
Não é esse o problema!
Да не в этом проблема!