Rimuru becomes the new teacher for Shizu's students. However, having been summoned into this world against their will and facing shortened lifespans as a result, the children's feelings are complicated, and they're reluctant to accept Rimuru. So Rimuru proposes a series of mock battles with each of them to ascertain their abilities and allow them to let off steam.
Well, that's it. You'd better 
call me "Sensei" from now on.
"حسناً، انتهينا. حريّ بك أن تناديني "سينسي
اعتباراً من الآن
Und vorbei. Ab sofort wird gesiezt.
Eso es todo.
Mejor llámame maestro desde ahora.
Eso es todo.
Mejor llámame maestro desde ahora.
Bene, abbiamo finito.
Pronto, acabou. A partir de agora
vai ter que me chamar de "sensei".
Всё, конец,
отныне называй меня «учитель».