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!
Because it's effective.
Na ja, weil er effektiv ist.
Porque es efectivo.
C’est parce qu’il est pratique.
Perché è efficace.
Porque é eficiente.
Потому что… оно эффективно в бою.