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.
That's just what grown-ups do.
هذا ما يفعله البالغون فحسب
So sind Erwachsene.
Eso hacen los adultos.
Eso hacen los adultos.
C’est comme ça qu’on progresse.
Ecco com'è il mondo degli adulti.
Como fazem os adultos.
Таков девиз всех взрослых.