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.
You will each fight a one-on-one 
mock battle with me.
كلّ واحد منكم سيقاتلني في معركة 
فرديّة صوريّة
Jeder von euch wird
einen Übungskampf gegen mich bestreiten.
Cada uno peleará contra mí.
Cada uno peleará contra mí.
Chacun votre tour,
vous allez venir m’affronter.
Ognuno di voi mi sfiderà in duello.
Agora farão individualmente
uma batalha simulada comigo.
Сейчас вы по одному
сразитесь со мной.