Touya and Minori and the rest of the players in the training camp are hitting a wall with the way they fight.  And Minori's suggestion is that they introduce themselves to one another!
I can... By the tone of your voice.
Und ob! Das verrät mir deine Stimme.
Se nota por el tono de tu voz.
Je le devine à ta voix.
L'ho capito dalla tua voce.
Claro que sei... pelo tom da sua voz.
По голосу!
Всё сразу стало ясно.